its the ammo. I have a Savage 10 in . 308 and when i first got it I picked up some BHA match 168s and some HSM 168 loaded with the Bergers. The HSM did exactly the same thing that you are describing. I later found out that Bergers are VERY sensitive to the distance from the lands they sit. I later loaded some 168 Bergers in the HSM brass and fiddled with OAL from the o give and got really good groups out of them. If it was me I would NOT worry about your gun.
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