The space between dot centers subtends one milliradian(mil). One mil. subtends 3.6 inches at 100 yards or 36 inches at 1,000 yards. To use this system effectively you must know the size of the target.
By measuring the height or width of a known (or approximately known target size) in mil- radians using the reticles, the target distance can be calculated as follows.
R = range in meters, H = target size in meters,
M=
R = 1000 * H / M
Military shooters are trained to know that the common male torso is 39 inches from crotch to top of head. This is very close to exactly one meter. This formula then becomes R = 1000 / M for a one meter target size.
All of the following formula are equivalent to the one above for estimating range.
R = range in meters, H = target size in inches,
M=
R = 25.4 * H / M
R = range in yards, H = target size in inches,
M=
R = 27.78 * H / M
R = range in yards, H = target size in feet,
M=
R=333.3 * H / M
US Army | USMC |
BULLET DROP COMPENSATOR
You should have zeroed your scope in at 200 yards. When shooting at longer ranges the bullet drop compensator can be adjusted for 200, 400, 600, 800 and 1000 yards (1800 yars for .50 BMG). Pending on the distance click the bullet drop compensator to the appropriate set- ting. This will automatically adjust your reticle for that particular distance. Your scope also comes with other cams allowing you to change your bullet drop compensator to work with the different rifles.
Bullet drop
compensator with interchangeable cams
CHANGING THE BULLET DROP COMPENSATOR
Set the bullet drop compensator to the 200- yard range). Then remove the elevation dust cover from the cam. Next you will find three small set screws on the bullet drop compensa- tor right above the yardage numbers. Remove these screws and lift the cam off of the scope. Once you have done this select the desired caliber cam you would like to use and place this cam where you removed the previous one
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(make sure that a replacement cam is set to the
MAINTAINING YOUR RIFLE SCOPE
Your rifle scope is waterproof and shockproof. However, you should never try to take apart or clean it internally (it will void your warranty). If your scope ever does need repairs or adjust- ments, it should be returned to ATN’s service department. The exposed optical surfaces will perform their best if they are occasionally wiped clean with a lens cloth or with optical quality lens paper like those for eyeglasses or
camera lenses. Maintain the metal surfaces of your rifle scope by removing any dirt or sand with a soft brush so as to avoid scratching the finish. Wipe down the scope with a damp cloth and follow with a dry cloth. Finally, going over the tube with a silicone treated cloth will restore luster and protect the scope against corrosion. Be careful not to touch the any of the lenses with the silicone cloth.
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