Sounds like a tight barrell to me, I have the same rifle and the biggest problem i have is getting a gunsmith to lighten the trigger pull to 2 lbs, when i first bought it new the trigger pull was 6 lbs. I got it lightened to 4lbs but it is still too heavy for my liking. My barrel is tight as well but it has not effected my grouping. I shoot 150 grain nosler partitions with 63 grains of IMR 4831 powder and can put a half dollar piece over 3 shots at 100. Thinking about buying a timney trigger for it.