User's Manual

14
ZEROING AND USING THE BDC DIAL
The elevation adjustment is equipped with a Bullet Drop Compensa-
tion (BDC) dial matched to the standard trajectory of M118LR 175
grain ammunition. Once zeroed, the BDC dial allows the user to
simply dial the elevation adjustment to the appropriate distance and
fire. The numbers engraved along the lower portion of the eleva-
tion dial represent the adjustment increment in mils. The numbers
engraved along the upper portion of the elevation dial represent
the distance at which the Mark 8 CQBSS will now be zeroed. For
example, to engage a target at 300 meters, simply pinch the eleva-
tion dial and rotate the adjustment until the “3” engraved on the
top portion of the BDC ring aligns with the indicator mark on the
maintube of the scope. The Mark 8 CQBSS will now be zeroed for a
300 meter shot.
In order for the BDC dial to perform properly, the dial must be set
to match the sight-in distance after the initial sight-in process. For
example, if the rifle has been zeroed in at 100 meters, the set screws
must then be loosened and the dial must be rotated to the “1”
before the set screws are retightened. If the rifle was zeroed at 300