WEBThe Boone and Crockett Big Game reticle is sighted-in by zeroing the rifle at the intersection of the Duplex reticle at either 200 yards (Group A and B), or 300 yards (Group C). For Group C cartridges sighted-in at 300 yards, the lower aiming marks will be correct at 400, 500, 550, and 600 yards.