I used a .264 Win. Mag. in long range matches in the late 1960's. Only bullets that shot good were Norma 139-gr. FMJBT nickel plated ones; held 3/4 MOA at 600, 1 MOA at 1000 yards. For 640 rounds. Then it went south in 3 shots to almost 3 MOA at 600. Hadn't dropped a point for 13 shots, then lost about 15 in the last 7.