MASTER THE A.R.T.
MASTER THE A.R.T.
Jim's first patent for the Leatherwood Principle (1964)
The Leatherwood principle is based on the notion that fine motor control is severely impacted when experiencing “nervous tension” or heightened stress.
Rather than having to dial clicks or guess holds on the reticle, the leatherwood principle eliminates the need for trajectory compensation with its integrated Trajectory cam. By turning the cam to frame the target, the Leatherwood Auto Ranging Telescope has already compensated for the bullet drop. This led to the phrase “Frame, Aim, Fire!”
In 1968, the 9th Infantry Division developed the first formalized sniper training program with the assistance of the US Army Marksmanship Training Unit (USAMTU). The successful field use of the Leatherwood Automatic Ranging Telescope and AMTU accurized M-14s by the 9th Infantry Division snipers led to the official acceptance of the weapon and sight as the XM-21 Sniper Weapon System.
Over the years, the Leatherwood scope achieved legendary status, serving in armed conflicts from the Vietnam War to the Gulf War. Numerous snipers attest to the effectiveness of the Leatherwood scope.
Today, the legacy carries on. The ART M1000-PRO, M1200-XLR and ART X-BOW are built upon the same battle proven and tested principle employed by the original Leatherwood Automatic Ranging Telescope.
Jim's first patent for the Leatherwood Principle (1964)
The Leatherwood principle is based on the notion that fine motor control is severely impacted when experiencing “nervous tension” or heightened stress.
Rather than having to dial clicks or guess holds on the reticle, the leatherwood principle eliminates the need for trajectory compensation with its integrated Trajectory cam. By turning the cam to frame the target, the Leatherwood Auto Ranging Telescope has already compensated for the bullet drop. This led to the phrase “Frame, Aim, Fire!”
In 1968, the 9th Infantry Division developed the first formalized sniper training program with the assistance of the US Army Marksmanship Training Unit (USAMTU). The successful field use of the Leatherwood Automatic Ranging Telescope and AMTU accurized M-14s by the 9th Infantry Division snipers led to the official acceptance of the weapon and sight as the XM-21 Sniper Weapon System.
Over the years, the Leatherwood scope achieved legendary status, serving in armed conflicts from the Vietnam War to the Gulf War. Numerous snipers attest to the effectiveness of the Leatherwood scope.
Today, the legacy carries on. The ART M1000-PRO, M1200-XLR and ART X-BOW are built upon the same battle proven and tested principle employed by the original Leatherwood Automatic Ranging Telescope.
How to Set the Cam on the ART Scope
Determining the Cam Setting from the Manual
Calculating a Custom Setting with a Ballistic Calculator
How to Set the Cam on the ART Scope
Determining the Cam Setting from the Manual
Calculating a Custom Setting with a Ballistic Calculator
In this section, you'll find a "Step by Step Guide" on setting the Trajectory CAM to match your bullet's trajectory.
Here is a video of Howard (hrfunk) setting the cam on his M1000-PRO using the Quick Start Guide.
Steps at glance...
1) Find your CAM setting in the Manual or Calculate it using a Ballistic Calculator
2) Loosen the Set Screw on the Calibration Ring 1-2 turns Counter Clockwise.
3) Line up the indicator arrow on the Trajectory CAM with the appropriate CAM setting on the Calibration Ring.
4) Tighten down the Set Screw on the Calibration Ring by turning it Clockwise.
How to Mount the ART on a Picatinny or Weaver Rail
Mounting the ART Scope is a simple process. All you need is a picatinny rail or a Weaver base.
Steps at a glance...
1) Place the ART scope on the picatinny rail and position the recoil lug on the bottom of the point within one of the slots on the rail.
2) Adjust the position of the scope on the rail so that you have the appropriate eye relief for your shooting position. When the scope has been positioned on the rail, press the scope forward so that the recoil lug is contacting the forward face of the picatinny rail.
3) Tighten the thumbscrews to hand tight.
Zeroing at a Closer Distance
Zeroing the ART Scope
If you know how to zero a scope, you know how to zero the ART.
The only difference is the distance you need to zero at.
Zeroing Distances for the ART Scopes
• M1000-PRO = 200 yards
• M1200-XLR = 300 meters or yards.
• M1000 (previous generation 2.5-10X) = 250 meters
WHY do I need to zero at the specified zeroing distance?
The CAM is cut at a ratio to compensate for your bullets trajectory from the zeroing distance.
As you turn the CAM (attached to your Zoom Ring) it elevates the rear of the scope and actually moves your zero outwards from the 200 yards...thus compensating for your bullet's trajectory. As you return or "zoom out", the base lowers back to its resting state and the original zero returns.
What if I do not have a range that is long enough?
The video "RANGE HACK - 25 Yard Zero" shows how a zero works and teaches you how to get an equivalent 200 yard zero at only 25 yards. This might be helpful for those who do not have a 200 yard range.
You can use the same principle to use a 100 yard range or 25 yard range to get your 200 or 300 yard zero. You just need to know how many inches high or low the bullet needs to pass through the target at the shorter distance.
Shooting F.A.S.T. (Frame Aim Shoot Technique)
Determining the Range from you to your target is critical when taking longer distance shots.
The ART Scope offers a simple method using the reticle to Frame • Aim • Shoot.
When shooting F.A.S.T. (FRAME • AIM • SHOOT TECHNIQUE), the shooter needs to frame a known sized target of 18" on the reticle. When the target has been properly framed, the cam will already have ranged and compensated for bullet drop to the target. This technique allows you to quickly engage targets at unknown distance.
The M1000-PRO and M1200-XLR also have ranging scales on the lower left and right quadrants which can be used to frame other known dimensions.
Dive deeper into the HR1 reticle by watching this video by Howard Funk.
Reticle Subtensions
• The center of the HR1 reticle has a 2 MOA by 2 MOA cross.
• The opening in the center of the HR1 can be used to frame known size targets that are 18" or 36".
• Every hashmark on the vertical and horizontal scales indicate a whole MOA subtension.
• There are 2 MOA tick-marks that indicates multiples of 5 MOA on both the horizontal and vertical scales.
• The ends of the horizontal and vertical axes are indicated by a 4 MOA tick-mark.
• The ranging scale in the lower right quadrant can be used to frame and range known sized targets from 9"-72" in length or height.
• This reticle is true at 10X.
Reticle Subtensions
• The XLR reticle is a second focal plane mil reticle.
• The center dot is 1/2 MOA.
• Every whole mil and half mil are indicated by tick marks on the axes.
• The opening at the center of the reticle can be used to frame and range a known size 1/2 meter (~19") target.
• Additionally, there are ranging scales that can be used to frame known sized targets by adjusting the magnification.
• The XLR reticle is true at 20X.
Automatic Vs Manual Mode Operation
Auto Mode, or Automatic Mode is when the Zoom Ring, Calibration Ring and CAM Ring are all working together to compensate for your bullet's trajectory.
Manual Mode is when the Zoom Ring is used independently from the CAM mechanism.
How to Engage Manual Mode
1) Loosen the set screw on the Zoom Ring 1-2 turns Counter Clockwise.
2) Pull the Zoom Ring towards you (rear of the scope). This disengages the Zoom Ring from the pins on the Calibration ring.
3) Set magnification by turning the Power Ring (ring closest to you). Set the distance by lining the arrow on the Trajectory CAM with the hashmarks on the calibration ring.
Scenarios where Manual Mode would be useful:
1) Initial Zeroing. Let's say you are zeroing the M1000-PRO at 200 yards and you want to use 10X to shoot at the target. Simply use Manual Mode to zoom in, but leave the CAM at its lowest point.
2) Shooting Known Distance. You have already framed your target in Auto Mode, so the CAM has compensated for the range, but you'd like to zoom in more on the target without impacting the range/bullet compensation. So after you've FRAMED your target, go to Manual Mode and zoom in.
**NOTE** if you are concerned about accidentally turning your CAM when you want to use Manual Mode, use the CAM locking Screw to tighten down the CAM.
Video Coming Soon!
In Automatic Mode:
If you're shooting low, adjust the cam setting lower 1-2 tickmarks. If you're shooting high, adjust the cam setting higher 1-2 tickmarks.
In Manual Mode:
If you're shooting low, adjust the cam distance 1-2 tickmarks higher. If you are shooting high, adjust the cam distance 1-2 tickmarks lower.
600 Yard Challenge
Want to test your ART Scope skills? Try the 600 Yard Challenge
Course of Fire:
1 shot at 200 yards
1 shot at 300 yards
1 shot at 400 yards
1 shot at 500 yards
1 shot at 600 yards
Total 5 Shots
Par Time: 1:00
Vietnam Era ART Scope Qualification
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