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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 = mil-radians of the image size:
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 = mil-radians of the image:
R = 25.4 * H / M
R = range in yards, H = target size in inches,
M = mil-radians of the image:
R = 27.78 * H / M
R = range in yards, H = target size in feet,
M = mil-radians of the image:
R=333.3 * H / M
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.
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
(make sure that a replacement cam is set to the
200-yard range. Then tighten the cam in place
by putting the three set screws back. Finally
replace the dust cover.
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.
Bullet drop
compensator with
interchangeable
cams
.2 mil
1
/
4
mil
1
/
2
mil
3
/
4
mil
1 mil
.1 mil
.25 mil
1
/
4
mil
1
/
2
mil
3
/
4
mil
1 mil
US Army
Mil-dot Reticle
USMC
Mil-dot Reticle