I zero my BCM/DD AR-15 with Leupold Vari-X 2 scope at 100 yds, then move back to 300 yards to shoot some steel using BulletFlight ballistic app on my iPhone. This is a great app for quickly adjusting for bullet drop and windage using known distances. Ammo is cheap Norinco brass 55g FMJ, but I still manage to shoot a couple of 1.5 inch groups at 100 yds.
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