Mine really liked the 45gr stuff, never found 50's and hated all 55gr factory ammo. I loaded some 55gr Sierra Gamekings over 24.5grs of H4895 with a CCI 400 Primer and set them .010 off the lands and my groups are great, much better than factory stuff. I got the load from the Sierra manual, it maxed out at 26.1, but mine is more accurate at 24.5grs, 25grs was good but 24.5 was great. Velocity is 3100fps.