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Seat a round in the chamber, then remove it and you should be able to see rifling inprinted into the lead. Check to see if your barrel is free floated from the stock by running a dollar bill between the barrel and forend. You might also check your action screws, they should be very close to the same (20-30 in lbs if the gun is not pillar bedded). Different ammo chambers differently, although I have found the Federal match ammo is a little tighter in most of my guns. When I change brands of ammo I will run a couple of dry patches through the bore and then it will take several rounds for the gun to settle down. With quality ammo I think your gun should shoot alittle tighter, I doubt that anything is wrong with your action or barrel. Make sure your parallax is set correctly. Hope this helps