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Hi wild, Dogdown covered well the points to watch, I would be surprised if your 3 shot strings heated the barrel to the extent it affected groups to the extent you observe. I have basically the same rifle (several years older) that will shoot just under 1 inch @100yds with factory Hornady light mag 180 gr (now discontinued). I just had Jason put his compensator on it and with the mt recoil lug, bolt shroud and pic rail I will load develop again and post results – I will test the factory stock and with the Berserk stock just to see if the wood stock is making trouble.
