AIM Sports Scopes - Manual (Page 20)

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Scopes that are equipped with reticles such as the Rangefinder
reticle or a BDC (Bullet Drop Compensator) turret allow the
shooter to manually set a reference point of impact based on the
current trajectory of the bullet. However, it is important to note
that scopes that have the rapid ranging reticles or a BDC may
require fine tuning to achieve maximum precision. Factors that
the shooter must take into consideration when using these fea-
tures are bullet weight, powder load, ammunition manufacturer,
and general shooting conditions.
Certain scope models have the ability to manually set the
windage and elevation adjustment turrets to “zero” once the
shooter determines that they have sighted in the scope for that
particular firearm. Scopes that have this capability will have a
small mark engraved below the windage and elevation turrets
facing the shooter, along with a range of numbers on the turrets
themselves starting from the number ‘0.’ To set the turrets to
“zero,” do the following:
1. When firearm is “sighted in” at the desired distance, note the
position of the number on the turret. The turrets should be
set on number ‘0’ from the factory.
2. Use a hex wrench to loosen the screw holding the turret cap
in place.
3. Turn the cap so that the number ‘0’ is now lined up with the
engraved marker below the turret. Do this process for both
the windage and elevation turrets.
4. Re-tighten the hex screw on the turret cap to lock it into
place. Your scope is now “zeroed” for that firearm.
Dials adjust easily to indicate the new zero position.