I tried the 348 grain powerbelts today @ 20 yards.. After those first 3 shots i should have stopped. It was a 3" group and got worse as soon as i moved it out to 30 yards lol. Its ok, when i bought the rifle i had a pretty good idea what the twist was so, its fine. It was still nice to try some conicals out of it. Next time im going to try some ball-ets and see what those can do. So far im dialed in for hunting season with a PRB load. Now if only the days would end sooner so hunting time could get here already.