AIM Sports Scopes - Manual (Page 19)

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BULLET DROP COMPENSATOR DIALS
Special bullet drop compensation (BDC) elevation dials are fea-
tured on selected scopes. These dials are calibrated to achieve
adjustment to specific distances rapidly by distance indicators
marked directly on the dials.
ZEROING THE WINDAGE AND
ELEVATION DIALS AFTER SIGHTING IN
All AIM scopes feature adjustment dials that can be repositioned
to align the marked zero of the dial with the position indicator
without changing the adjustment setting of the scope. This
allows the shooter to know the original zero of the rifle in the
event that further adjustments are made in the field.
To reposition the dials, place a coin or screwdriver in the slot in
the numbered dial and rotate it so that the zero aligns with the
stamped line indicator mark on the top of the adjustment screw
that is perpendicular to the coin slot.
RANGE ESTIMATING SCOPE
Selected AIM scopes have a built in range estimator. This sys-
tem uses the Duplex portion of the reticle in combination with an
additional set of numbers on the power selector ring. (Also see
the AIM Range Estimating Reticle Instructions for other reticle
types.) In scopes with this feature the space between the tip of
the thicker post of the Duplex reticle and the center of the reticle
covers 16 inches at 200 yards (the size of a Whitetail buck from
backbone to brisket.)
NOTE: The Duplex reticle was designed to estimate ranges
based on the backbone to brisket dimension of a Whitetail
buck. The distance of other game with a body dimension
that is known to be 16 inches (or 32 inches if the measure
ment is taken from post to post instead of post to crosshair)
may certainly be estimate. It is necessary to know the approximate
physical size of your target whenever you estimate range.