i had the same problem with a shotgun of mine. it was a rifled barrel and i was using all different brands ofammo. i could shoot all my other guns straight, but this one wouldnt hit paper consitantly. i tried everything i hear or read about. everyone said try as many brands of ammo as i could. so i tried all the brands on the shelves. it only made me poorer. so i did some studying of my own. i baught this copper, lead, and nitro fouling remover. i was amazed at what fell out of the barrel. it appeared to be metal shavings. almost as if they milled it in the factory and they didnt clean it out. anyways, i took it to the range the season after. i shot it and the groups got a bit tighter. they were all on the paper. i cleaned it again,and again. i took it out again, i was hitting 5 inch groups so i still wasnt happy. so i hunted with one of my other guns for that season. the next season i cleaned it out again i braught it out and i was shooting groups aboutthe size of about a 50 cent peice at 155 yards. that was 5 years ago, and still to this day i get the same very small groups. i dont know why it did this, but i do know that it frusterated me. there were times when i even considered getting rid of it. now im glad that i didnt. the gun has helped me take quite a few deer. i have read articles about seasoning your barrel. i dont know if thats what i did in that 3 year span? but i do know this, the gun has made an absolute 360 degree turn around as far as performance goes. so if i was you, i wouldnt give up. i would talk to more people and see what they say. but most importantly, " YOU STILL ARE HITTINGGAME IN THE FEILD" good luck with this delema and God bless.