Got a gun vise or solid rest? Put up a target at 20 feet. Aim at a very small mark and fire. Lock rifle in vise with crosshairs on point of aim.Without moving rifle,adjust scope so crosshairs intersect the bullet hole. This will put you dead on out beyond 50 yards or more. In the Marines we shot the 900 inch range. Gives you Battle Zero out to 300 yds with an M-14.

Charlie