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Page 1: Huskemaw Owner's Manual - lrhmag.comlrhmag.com/images/Huskemaw-2012-Owners-Manual.pdf · turret on a rifl e scope which is calibrated in yards rather than the standard MOA (Minute

“If you’re not the lead dog, the view never changes.”

Eliminate the Guess!

Ow ner’s M anual

Rifle scope

Page 2: Huskemaw Owner's Manual - lrhmag.comlrhmag.com/images/Huskemaw-2012-Owners-Manual.pdf · turret on a rifl e scope which is calibrated in yards rather than the standard MOA (Minute

TABLE OF CONTENTS

The Huskemaw Technology .................................................................3

Product Specifi cations .........................................................................5

Windage & Elevation Adjustments ......................................................7

Focusing the Reticle ............................................................................8

Adjusting Magnifi cation ......................................................................8

Parallax and Adjustments ...................................................................9

The RFBC Turret ...................................................................................10

Wind Hold Compensation ....................................................................11

Doping the Wind .................................................................................12

Rangefi nding ......................................................................................13

Scope Mounting and Data Collection ..................................................15

Ring Lapping .......................................................................................16

Reticle Alignment ...............................................................................16

Eye Relief ............................................................................................17

Bore Sighting ......................................................................................17

Collecting BDC Drop Data ....................................................................18

True Ballistic Program .........................................................................19

Barrel Break-in ....................................................................................21

Installing your Custom RFBC Turret ......................................................21

Zero Index Ring ...................................................................................22

Sighting in Your Scope On Location .....................................................22

Manual Data Sheet ..............................................................................22

Warranty & Repair ...............................................................................23

List of Figures & Tables ........................................................................2

Page 3: Huskemaw Owner's Manual - lrhmag.comlrhmag.com/images/Huskemaw-2012-Owners-Manual.pdf · turret on a rifl e scope which is calibrated in yards rather than the standard MOA (Minute

INDEX OF FIGURES AND TABLES

Figure 1. Scope Features and Locations ...............................................5

Figure 2. Hunt Smart Reticle ...............................................................6

Table 1. Product Specifi cations ............................................................6

Figure 3. Click calibrated Elevation turret & 1/3 MOA

calibrated Windage turret .............................................................7

Figure 4. Unfocused and properly focused adjustment dial .................8

Figure 5. Magnifi cation Ring ...............................................................8

Figure 6. Parallax error and parallax adjustment dial ..........................9

Figure 7. Dialing the RFBC ...................................................................10

Figure 8. 3 MOA wind hold @ 20X .......................................................11

Figure 9. Wind Rosette ........................................................................12

Figure 10. The appearance of mirage and relative wind speed ............13

Figure 11. Back to Brisket Sub-Tension measurements ........................14

Table 2. Back to Brisket Measurements for Mature Males ....................15

Figure 12. Ranging ring and bracketing example ................................14

Figure 13. Mounting Tools ...................................................................15

Figure 14. Lapping rings and Leveling scope .......................................16

Figure 15. Bore-sighting your rifl e scope .............................................17

Figure 16. Load Data ...........................................................................19

Figure 17. Sighting Data and Conditions .............................................19

Figure 18. Calculate and Range Card ...................................................20

Figure 19. Installing RFBC Turret ..........................................................21

Table 3. Range Click Values ..................................................................22

Page 4: Huskemaw Owner's Manual - lrhmag.comlrhmag.com/images/Huskemaw-2012-Owners-Manual.pdf · turret on a rifl e scope which is calibrated in yards rather than the standard MOA (Minute

THE HUSKEMAW TECHNOLOGY

The Huskemaw Optics’ Bullet Drop Compensator (BDC) is a target style elevation

turret on a rifl e scope which is calibrated in yards rather than the standard MOA (Minute

of Angle) clicks. By simply turning the BDC turret to the range in yards, rapid fi eld

adjustments for bullet drop at varying distances can be accommodated. Because the

Huskemaw BDC turret is cartridge specifi c, trajectories are precise to that load in that rifl e.

Unfortunate for the consumer, not all BDC turrets are created equal. Some are so crudely

constructed that they require tedious hours at the range determining the zero adjustments

for all ranges. This creates a turret for that altitude, but leaves no provisions for the

varying air densities one may encounter while hunting. While other turrets are naively

created using a bullets manufacturer’s estimated G1 Drag model Ballistic Coeffi cient (BC)

and a muzzle velocity that is usually estimated at sea level. In summary, most Ballistic

Coeffi cient/Velocity combinations produces BDC turrets accurate for distances of 300-500

yards.

Huskemaw’s method of creating BDC turrets starts where others have left off . First, an

estimated bullet path, or trajectory, is created by our software through our web interface

(HuskemawOptics.com) using the manufacturer’s BC and an average velocity. A drop chart

is printed and taken to a shooting range for completion. Correction factors are obtained

by adjusting the elevation turret to the amounts specifi ed on the data sheet for the

particular target distances and shooting three targets at close, medium, and long range.

It is recommended that the long range target is at least 70% of your maximum expected

distance.

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4

Huskemaw Long Range Optics

Muzzle velocities must be recorded with a chronograph and all values are used to

calculate the average. Measurements for altitude and temperature are also taken to

determine air density. After a 5-10 shot group, measure each shot from the group center

to obtain the statistical average of dispersion. All of these steps are demonstrated in your

Huskemaw Optics’ DVD.

The information from the completed data sheet is entered into the web-based BC

Calculator. This proprietary software generates a Ballistic Profi le (BP) which includes a

modifi ed bullet drag model and a true ballistic coeffi cient. This BP can be used to create

precise BDC’s for all air densities, form coastal bears at sea level to Marco Polo sheep at

15,000 ft.

The added bonus that Huskemaw BDC turrets off er is compensation for wind which

is present in most hunting situations. Wind will cause signifi cant defl ection and when

shooting long distances, these eff ects are magnifi ed. A standard bullet drop compensator,

while being inadequate in bullet drop, makes no provisions for wind compensation. The

Huskemaw uses patent-pending windage compensation technology and when applied

to the Hunt Smart Reticle, it allows for rapid and precise adjustments dubbed the “Rapid

Field Ballistic Compensator” or “RFBC” program.

While taking big game at long ranges is possible with this technology, it is strongly

recommended that much time is spent at the range to build confi dence at extended

ranges. It is the responsibility of each hunter to use the best judgement to ethically push

the boundaries of long range hunting. At ranges beyond 1000 yards, the eff ects of several

ballistic phenomena begin to show eff ects on bullet placement. If hunters are planning to

shoot beyond these ranges it is important to fully understand ballistics.

With this technology you can truly - eliminate the guess!

Page 6: Huskemaw Owner's Manual - lrhmag.comlrhmag.com/images/Huskemaw-2012-Owners-Manual.pdf · turret on a rifl e scope which is calibrated in yards rather than the standard MOA (Minute

5Nothing is safe inside a half mile...

Huskemaw Optics | 5-20 Long Range Owner’s Manual

PRODUCT SPECIFICATIONSProduct Highlights

The Huskemaw Optics 5-20 is the most advanced Ballistic Compensating rifl e scope

available. It includes a patent pending Rapid Field Ballistic Compensator and our simple,

yet powerful, Hunt Smart reticle. The 30mm main tube, 50mm objective lens, and side

focus parallax correction dial make the 5-20 scope an outstanding choice for both varmint

hunters and target shooters, but includes special features for the big game hunter. Ballistic

compensation and parallax adjustments are easily made without breaking shooting

position and the 50mm objective lens creates a brighter image for high magnifi cation and

low light use.

Huskemaw’s ballistic compensation technology is the fi rst to accurately determine the

drag model and Ballistic Coeffi cient (BC) for your bullet in your system. The 5-20 is the fi rst

rifl e scope built specifi cally to take advantage of a long range hunting situation, and the

only scope with our patent pending windage compensation technology--anyone shooting

at extreme ranges in hunting conditions without windage compensation is just guessing.

Figure 1. Scope Features and Locations

1. Objective Bell/Lens 5. Ranging2. RFBC Turret 6. Zero Index Ring3. Windage Adjustment 7. Parallax Adjustment4. Magnifi cation 8. Focus Adjustment

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6

Huskemaw Long Range Optics

Figure 2. Hunt Smart Reticle.

MOA sub tensions for

10X magnifi cation.

Halve values for 20X.

Table 1. Product Specifi cations

Actual Magnifi cation 5X by 20X

Total Length 13.7in | 346.8mm

Eyepiece Length 2.58in | 65.6mm

Objective Length 4.301in | 109.25mm

Objective Diameter 2.3in | 59mm

Eyepiece Diameter 1.7in | 43.6mm

Tube Diameter 1.18in | 30mm

Weight 23oz | 652mm

Eye Relief 3.43:4.06in | 87:103mm

Objective Lens Diameter 2.0in | 50mm

Exit Pupil Diameter 0.38:0.1in | 9.6:2.5mm

Max Adjustment 70in @ 100yds | 177.8cm @ 100m

Adjst/Elev. Dial Revolution 20ft | 6.1m

Field of View (FOV) 18.5ft:4.9ft @ 100yds | 6.0m:1.6m @ 100m

Max. Mount Ring Spacing 5.7in | 144mm

Front Ring Space 2.2in | 55.1mm

Rear Ring Space 2.1in | 54.4mm

Page 8: Huskemaw Owner's Manual - lrhmag.comlrhmag.com/images/Huskemaw-2012-Owners-Manual.pdf · turret on a rifl e scope which is calibrated in yards rather than the standard MOA (Minute

7Nothing is safe inside a half mile...

Huskemaw Optics | 5-20 Long Range Owner’s Manual

WINDAGE AND ELEVATION ADJUSTMENTS

The factory elevation turret has markings and numbers that indicate clicks. The scope

adjustment is calibrated to provide 1/3 MOA per click with 60 clicks or 20 MOA total

adjustment per revolution. This allows simple compensation when your Range Card

requires a certain number of clicks adjustment (for example 43 clicks at 800 yards). This

turret is temporary and will only be used to collect True BC data for your custom RFBC

turret. The windage adjustment, the windage turret is marked in MOA from 0-10-0.

Turning three clicks left form zero will show one MOA and turning three clicks right from

zero will also show one MOA.

Figure 3. Click calibrated Elevation

turret (0-60)

1/3 MOA calibrated

Windage turret (0-10-0)

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8

Huskemaw Long Range Optics

FOCUSING THE RETICLE

The Fast Focus Eyepiece allows for simple and precise focus control of the Hunt Smart

Reticle. It is not intended to focus the optical system of target. The method of adjustment

is simple: obtain a view through your scope with a light background of constant color

(blue sky, or a painted white wall), then turn the adjustment ring (Number 8 in Figure 1)

until the reticle appears focused with sharp and defi ned lines. To double check, look away

from the scope and let your eye relax, then quickly check the reticle again for focus while

keeping your eye relaxed.

ADJUSTING MAGNIFICATION

To adjust the magnifi cation of

your Huskemaw Optics rifl e scope,

turn the adjustment ring clockwise

or counterclockwise until the desired

magnifi cation is indicated on the power

ring.

Figure 4. Unfocused and properly focused reticle

Figure 5. Magnifi cation Ring (5-20)

Page 10: Huskemaw Owner's Manual - lrhmag.comlrhmag.com/images/Huskemaw-2012-Owners-Manual.pdf · turret on a rifl e scope which is calibrated in yards rather than the standard MOA (Minute

9Nothing is safe inside a half mile...

Huskemaw Optics | 5-20 Long Range Owner’s Manual

PARALLAX AND ADJUSTMENT

Parallax is the apparent movement of objects within the fi eld of view in relation to the

scope reticle. You can check the parallax error of any scope by sighting an object at normal

sooting distances and moving your eye side to side or up and down, as far as you can,

keeping the rifl e steady on the target. The apparent movement of the reticle in relation to

the target is parallax. There is a great example of parallax error on your Huskemaw Optics

DVD.

To adjust the parallax on the Huskemaw scope, turn the parallax adjustment knob

clockwise or counterclockwise until there is no apparent movement between the target

and the reticle. For a fast, in the fi eld adjustment, use the yardage calibration numbers to

roughly dial in the proper parallax adjustment.

Figure 6. Parallax error and parallax adjustment dial.

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10

Huskemaw Long Range Optics

THE RFBC TURRET

Once the data has been collected and submitted for the custom RFBC turret, the turret

will be etched and shipped for installation. Turn the factory turret to zero and remove the

retaining screw. Remove the factory turret and place the RFBC turret on placing the 2 at

zero then adjust the zero stop ring (Figure 7). Now you are ready to use your Huskemaw

rifl e scope to its fullest potential. Test your zero at the range and adjust accordingly. After

the RFBC turret is properly adjusted, range the target and hold the cross hairs dead on to

make a perfect shot.

Figure 7. Dialing the

RFBC from 200

to 725 yards

Page 12: Huskemaw Owner's Manual - lrhmag.comlrhmag.com/images/Huskemaw-2012-Owners-Manual.pdf · turret on a rifl e scope which is calibrated in yards rather than the standard MOA (Minute

11Nothing is safe inside a half mile...

Huskemaw Optics | 5-20 Long Range Owner’s Manual

WIND HOLD COMPENSATION

Knowing the way wind eff ects your bullet’s fl ight is the key to accurate long range

shooting, unfortunately this science is beyond the scope if this manual. Refer to literature

or the Internet for more information on external ballistics. Read the next section for a

primer on wind doping.

Your Huskemaw Optics Long Range rifl e scope and custom RFBC turret used with the

Hunt Smart Reticle is the simplest and most advanced system for windage compensation

available. To correct for a crosswind, you must fi rst estimate the crosswind velocity, and

adjust your RFBC turret for the proper distance to target. In Figure 7 the bottom set of

numbers indicates the distance to the target, and the top set of numbers represents the

windage hold in MOA for a 10 mph wind at that distance when the magnifi cation is set

to 20X. In this example, a 700 yard target has a wind hold value of “3” - three minutes of

angle wind hold. For a 5 mph wind, reduce the number by half, for a 20 mph wind, double

the number. That MOA number corresponds to the MOA hash marks in the Hunt Smart

Reticle. Just dope the wind, dial, and hold.

Figure 8. 3 MOA wind hold @ 20X

Page 13: Huskemaw Owner's Manual - lrhmag.comlrhmag.com/images/Huskemaw-2012-Owners-Manual.pdf · turret on a rifl e scope which is calibrated in yards rather than the standard MOA (Minute

12

Huskemaw Long Range Optics

DOPING THE WIND

Extreme range shooters spend their time studying wind - not drop charts. Wind speed

and direction are the only variables that cannot be directly measure - not to mention

rarely constant. The Huskemaw technology allows very rapid and precise compensation

using a method of wind bracketing. This method is outlined below, and allows ethical one

shot kills past 700 yards in windy conditions.

With this wind compensation technology, you are only required to

bracket your crosswind velocity as 0, 5, 10, and 15 miles per hour.

This requires two determinations. First, you can estimate the total

wind speed, then you need to determine the component of that

velocity that is traveling across your line of fi re.

Determining wind speed takes practice. A wind meter will

help you to learn the 5, 10 and 15 mph brackets. As you guess

a speed, view the movement of vegetation and dust, then use

the wind meter to measure. Repeated practice will allow quick

adjustments for changing wind conditions in the fi eld without using the wind meter. A 5

mph wind will be felt distinctly on your face, with vegetation (leaves, grass, etc.) stirring

continuously. A 10 mph breeze will raise dust and blow around loose paper, seeds, etc. A

15 mph breeze will cause small trees and bushes to sway.

To determine the amount of

wind that is blowing directly

across your line of fi re, use the

simple wind rosette multipliers

to correct for wind direction.

For example, for a 10 mph wind

from 10 to 4 o’clock, multiply by

.75 for a 7.5 mph cross wind.

Figure 9. Wind Rosette

Page 14: Huskemaw Owner's Manual - lrhmag.comlrhmag.com/images/Huskemaw-2012-Owners-Manual.pdf · turret on a rifl e scope which is calibrated in yards rather than the standard MOA (Minute

13Nothing is safe inside a half mile...

Huskemaw Optics | 5-20 Long Range Owner’s Manual

Figure 10. The appearance of mirage and relative wind speed.

Finally, with practice, mirage can also be used to determine wind speed and direction.

To see the mirage, adjust your scope to 20X, and manipulate the side focus adjustment

to focus on the mirage instead of the target. A straight up or boiling condition is not

wind, the mirage tips at a 45 degree angle in a 5 mph wind, and mirage blowing parallel

indicates a 10 mph wind. Mirage is handy, but like all methods of wind doping, only

practice will allow satisfactory fi eld use.

RANGEFINDING The advancement in technology for aff ordable, hand-held laser rangefi nders has

allowed the ethical deployment of the long range shooting system. The best way to

determine the range to your target is use a quality laser rangefi nder.

There may be a circumstance where you may be without a laser rangefi nder: forgot

to pack it, dead batteries or it’s just not working properly. A contingency built into the

Huskemaw rifl e scope provides an alternate method of range fi nding that will save the

day. This method is based on the hand held stadimeter developed in the late 1890’s.

By using the sub-tension of the Hunt Smart Reticle to bracket the game animal from

back to brisket and, using known measurements, you can range the animal with the

magnifi cation ring. Figure 11 shows the measurement used for each sub-tension: fi rst

mark - 12” , second mark - 18” and third mark - 24”. The top duplex to center is 30” and the

bottom duplex to center for a 36” target.

Vertical - 0 mph 45 deg - 5 mph Horizontal - > 10 mph

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14

Huskemaw Long Range Optics

Simply turn the magnifi cation ring until the reticle

fi ts right on the tope and bottom of your target, then

read the distance to target in hundreds of yards.

The only unknown factor in determining range is

knowing the height of the target you are ranging.

Fortunately, most mature species of game maintain

fairly consistent back to brisket dimensions. Use this

table as a reference.

Figure 12. Ranging ring and bracketing example.

Table 2. Back to Brisket

measurements for mature males.

Coyote 9"Antelope 12"Whitetail 16"

Mule Deer 18"Caribou 24"Cow Elk 24"Bull Elk 30"

24"

30"

36"

12" 12"

18"18"

24" 24"

18"

12"

Figure 11. Back to Brisket Sub-Tension measurements.

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15Nothing is safe inside a half mile...

Huskemaw Optics | 5-20 Long Range Owner’s Manual

SCOPE MOUNTING AND DATA COLLECTION

Please view the Huskemaw Optics DVD for an in-depth demonstration of tools and

procedures require for proper scope mounting. A general overview follows. To properly

mount your Huskemaw Optic rifl e scope, you will want the right scope rings, a torque

wrench, a lapping bar with compound, a thread lubricant, and a reticle leveling device.

Your optics retailer should have these items available for purchase.

Check you screw holes on your action for debris and clean if necessary. Most ring and

base screws are pre-lubricated; supplementing that lubrication with a commercial product

is advisable. In addition to the threads, be sure to lubricate the shoulder of the screw that

contacts the scope base. The proper torque will depend on the type and size of the screw.

Contact the manufacturer of the scope rings for exact torque specifi cations.

Most base screws will need to be tightened to 30-40 in/lbs to prevent loosening Rings

will need to be tightened to about half of the value of the bases to prevent damage to the

scope tube. A mild thread locking agent could be applied here, as the pre-load on the ring

screws is not enough to positively prevent loosening.

Figure 13. Mounting Tools

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16

Huskemaw Long Range Optics

RING LAPPING

For aluminum rings, it’s recommended to lap the bottom half of the horizontally split

ring for at least 75% contact. For steel rings, lap both the top and bottom half of the rings.

Lapping the rings increases surface contact for a sturdy, slip-free mount. Unlapped rings

place large stresses on scope body and internal components.

RETICLE ALIGNMENT

When using BDC type compensation to shot extended to long ranges, cant and

misalignment of the elevation turret assembly can cause signifi cant error. A scope or

reticle leveling tool will promote proper alignment before tightening your scope rings. Just

follow the manufacturer’s instructions.

Figure 14. Lapping rings and Leveling scope.

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17Nothing is safe inside a half mile...

Huskemaw Optics | 5-20 Long Range Owner’s Manual

Figure 15. Bore-sighting your rifl e scope

EYE RELIEF There is nearly four inches of eye relief available. Use as much as possible by mounting

the scope as far forward as possible. It is also recommended to use rings that mount the

scope as low as possible. This will allow consistent cheek weld and accurate shooting.

BORE SIGHTING Before taking your fi rst shot, spending a little time bore sighting your rifl e will save a

lot of time and ammo while sighting in the gun. Existing tools that facilitate bore sighting

include collimators and laser tools - follow the manufacturer’s instructions.

If these tools are not available, use this alternative method: Set up a target at 25 or 50

yards. Set up your gun on a solid rest and remove the bolt. The trick is to center the target

in the very center of the barrel. Try centering the circle formed by the muzzle end inside

of the circle formed by the chamber and throat. Once the bore is centered, just align the

scopes reticle on the same target. Take a shot and make fi ne adjustments. Make three

shots at 100 yards and adjust as needed.

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18

Huskemaw Long Range Optics

COLLECTING BDC DROP DATA

Our True BC process requires you to provide several key pieces of external ballistic data

to obtain the True BC, but once determined, the most accurate bullet drop compensating

turret can be created, the windage-enabled RFBC Turret. After mounting the scope, the

process requires several shot groups at various ranges to obtain a correction factor. The

following key information will be required:

1. Chronographed Velocity (averaged from a minimum of 5 shots).

2. Altitude of collection site.

3. Temperature of collection site.

4. From a 200 yard zero, the drop in clicks for a mid and long range target. Your

long range target should be at least 70% of your desired furthest range.

Once this information has been collected, the unique feature of our process is that a

Drop Compensating Turret can be created for ANY altitude and temperature. For example,

if you are shooting your data at sea level and are planning a trip to the Rocky Mountains

for elk hunting at 7000 feet elevation, a turret can be calibrated for that air density

based on the BC collected at sea level. The less dense the air, the fl atter the trajectory. It

is important to use a turret that has been calibrated for your expected elevation plus or

minus 2000 feet. However, temperature changes can off set elevation changes, therefore,

A 7000 feet 30 degree turret will have very little deviation from a 5000 feet 80 degree

turret.

TRUE BALLISTIC PROGRAM

A signifi cant benefi t to using our online BC Calculator is the drop chart, or range card,

which can be created based on expected conditions, such as velocity, temperature,

altitude, barometric pressure, humidity, wind and manufacturer’s BC (varying bullets are

available in a pick list). The Range Card displays a table by range with velocity, energy,

wind defl ection and clicks of adjustment for each range.

Visit http://www.huskemawoptics.com and click the menu item to “BC Calculator.”

Begin entering your information in the appropriate sections.

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19Nothing is safe inside a half mile...

Huskemaw Optics | 5-20 Long Range Owner’s Manual

Figure 17. Sighting Data and Conditions

Sighting Data section

• Scope Height - inches

from center of bore to center

of scope (default: 1.75)

• Impact Range - range

used for Zero (default: 200)

• Impact Height - When

necessary, apply an off set

value for correction (default: 0)

• Incline Angle - When necessary, apply an angle of incline (default: 0)

• Wind Speed - Enter a wind speed value in this fi eld to display the wind defl ection

hold in MOA clicks on the range card (default: 10)

• Click Value - Enter the amount of Minutes of Angle (MOA) that each click of the

turret equals (default: .333333

Conditions Section

• Altitude - Enter the desired altitude the range card will be created for

• Temperature - Enter the desired temperature the range card will be created for

• Pressure - Enter the anticipated barometric pressure for the range card (pressure will

change to the mean average for the entered altitude and temperature

• Humidity - Enter the anticipated humidity for the range card

g g g

Load DataSelect your bullet from

the list. If your bullet is

not available, then enter

your load description and

the bullet weight. The

manufacturer’s ballistic

coeffi cient will be used in

another section. Figure 16. Load Data

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20

Huskemaw Long Range Optics

A range card will be created in the lower

portion of the BC Calculator window.

Scroll down to view the range card (Figure

18). There are three options to change

the units of measure for the following

columns:

• Range - yards or meters (default:

yards)

• Defl ection - MOA (Minutes of Angle),

Clicks (based on the click value entered

in the Sighting Data section) or inches

(default: MOA)

• Path - MOA (Minutes of Angle),

Clicks (based on the value entered in the

Sighting Data section) or inches (default:

Clicks)

When any Alternate Path options are

selected, additional columns will be added

using the Path unit of measure.

NOTE: The initial range card printed is for click estimation only. Once the true ballistic

coeffi cient is obtained, the range card will be accurate and should match your range and

click values.

In the True BC Data Section the Ballistic Coeffi cient value will be retrieved from

the selected bullet. If no bullet was selected, enter the manufacturer’s BC to print an

estimated range card or enter the Muzzle Velocity to calculate the True BC. The Field

Shooting Data Section is used for correcting the range card after returning from the range.

Enter the far range value and the clicks to hit that target OR the clicks from the initial

range card and the inches a fi ve-shot group average is from center.

Press the Calculate button.

Figure 18. Calculate and Range Card

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21Nothing is safe inside a half mile...

Huskemaw Optics | 5-20 Long Range Owner’s Manual

BARREL BREAK-IN The BC Calculator requires an average chronographed velocity as one of the components

in order to create an accurate drop compensating turret. It has been our experience to fi nd

velocity variations as much as ±75 fps with the fi rst 100 rounds through a new barrel. For

this reason, it is recommended to shoot 30 to 50 rounds to stabilize the velocity before

gathering data for the True BC process. There is much information available on break-in

procedures, however, we have found this simple procedure until velocities stabilize: Shoot

once and clean, using separate cleaners for carbon and copper, ten times. Shoot three-

shot groups and clean fi ve times. Finally, shoot fi ve-shot groups and clean until velocities

stabilize. Once velocities stabilize, then fi nd a load that presents the tightest group. This

is the basic, but important, barrel break-in and load development steps for precision long

range shooting.

INSTALLING YOU CUSTOM RFBC TURRET After you receive your custom RFBC

turret, installing it is easy. With the

original turret adjusted properly for a 200

yard zero and preventing the turret from

turning, use a coin or case head to loosen

the retaining screw. Remove the screw

and lift off the factory turret. Install the

RFBC turret with the 200 yard indicator

mark coinciding with the mark on the

zero stop ring. Replace and tighten the

retaining screw.

With the new RFBC turret installed,

verify your zero at the range. Adjust the

scope as necessary for an exact zero, and

reset the turret to match.

Figure 19. Installing RFBC turret.

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22

Huskemaw Long Range Optics

ZERO INDEX RING

The zero index ring has a small set screw that locks its adjustment. Loosen the screw

with the provided jeweler’s screwdriver, and rotate it until it just touches your RFBC turret

when set at 200 yards. Then back if off until the fi rst mark is in alignment with the 200

yard indicator mark. Tighten the set screw until snug - do not over-tighten.

SIGHTING IN YOUR SCOPE ON LOCATION

Upon arrival at your hunting destination, it would best to make some test shots to prove

the turret. Range an inanimate object between 500 and 700 yards, dial the turret and test

fi re with a spotter. Make any necessary adjustments for a precise hit. Use the following

chart for third-minute adjustments:

Range in yards Measurement per click200 0.7 inches300 1.0 inch400 1.3 inches500 1.7 inches600 2.0 inches700 2.3 inches800 2.7 inches900 3.0 inches

1000 3.3 inches

Table 3. Range Click Values for the 5-20 scope

MANUAL DATA SHEET To get your custom RFBC turret, you will need to collect the following data. The turret

can also be ordered online at http://www.longrangestore.com

If you cannot use the Internet, you may record the required information below and a $15

entry fee and mail to: Huskemaw Optics, PO Box 1150, Cody, WY 82414.

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23Nothing is safe inside a half mile...

Huskemaw Optics | 5-20 Long Range Owner’s Manual

1. Huskemaw rifl e scope serial number: __________________________

2. Load Description (caliber and bullet type and size):

3. Zero Range (usually 200 yards):______________

4. Manufacturer’s published BC: ______________

5. Muzzle velocity (average from a 5-shot minimum):__________________

6. Altitude when data was collected:__________________

7. Temperature when data was collected: ________________

8. Mid range distance and clicks (Ex. 400 yds / 43 clicks):

9. Far range distance and clicks (Ex. 700 yds / 43 clicks):

Provide the altitude and temperature for your expected hunting conditions. Your turret

will be calibrated to these conditions.

Temperature:_____________________

Elevation:_____________________

Shipping Address: _______________________________

_______________________________

_______________________________

WARRANTY AND REPAIR

If your Huskemaw product fails to perform in any way, please contact a Huskemaw

Representative to determine if the problem can be solved without returning the product.

Many times, the problem can be solved without sending the scope to us. Huskemaw

technical service will assist you with the problem in the best and most effi cient manner.

Please follow these steps when returning any product to Huskemaw Optics:

• Remove mounting rings, covers, and all other accessories from the product.

• Record the serial number of the product and store it in a readily available location.

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24

Huskemaw Long Range Optics

• Include a note with the product indicating the reason the product is being returned.

• Provide your name, address and telephone number with the note.

• If possible, ship the product in its original packaging.

• Use sturdy outer packaging securely and use packaging tape on the outside.

• If possible, ship by a traceable parcel service and insure against loss.

Huskemaw Optics

115 W. Yellowstone Ave.

Cody, WY 82414

Contact Huskemaw Optics prior to shipping your product by calling 1-866-780-1072, or

writing [email protected].

Conditions of Warranty:

All Huskemaw Rifl e Scopes provides a lifetime warranty. The warranty is subject to the

following conditions:

• Huskemaw Optics will repair or replace unit at our discretion.

• Claims under warranty are null and void if the defect has been cause of

improper handling or if the serial number has been obliterated.

• Warranty Card must be sent to Huskemaw Optics following the purchase

to Huskemaw Optics; P.O. Box 1150, Cody, WY 82414.

• When submitting claims under warranty please return the Huskemaw

Scope with a description of the claim to the Customer Service

department

Record of Purchase:

Serial Number:

Date of Purchase:

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Every Huskemaw rifle scope is of exceptional qualityand designed to deliver the best compensation.


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