I have a Savage 12bvss in 308 that I bought used. It does not appear to have been fired much. I've tried Winchester 150, Federal 150, Remington 125 "reduced recoil", and surplus rounds. All except the Rem 125 flatten primers. Have only tried one hand load so far, 168 A-max over 40gr of RL15, and it flattened the primers too. Checked head space with go/no-go and it checks good. The gun is accurate shooting under an inch with Fed 150 and the A-max loads, but for the life of me I can't figure out what is causing the high pressure and flattened primers. Any rifle country gurus that might know what the problem is with this gun?