Quote Originally Posted by LG
Quote Originally Posted by Elkbane
Are you using the same scope mounts? Same rings? I can't imagine 3-5" groups at 50 yards unless there is some fairly gross mechanical issue. If you know your scopes are good, I'd set the rifle in a vice and push laterally on the scope obj bell and see if you get any deflection. My guess is there is something loose in the mount/action or mount/ring connection.

Elkbane
+1

Check the bases and rings thoroughly. Perhaps the bases are undersized (allowing some lateral play even when the rings are tightened all the way).
Thanks for that LG ,but mounts have been cheaked recheaked and changed twice .Could the crown been off centre that little bit make it shoot so bad?