I got a Ruger Yukon Magnum a couple years ago as a gift, and could never get it to group. I've put about 750-800 shots through it. I thought this would be an adequate break in period. I've tried both iron sights and the included scope, and can't get a group smaller than 5 inches at 20 yards. I've tried Crosman Premier Hollow Points, H&N Hunters, Polymags, and RWS Superdome pellets. All the same results. After every shot, you can't see down the barrel due to the amount of smoke rolling out. I would return it, but the warranty was only for 60 days. Any suggestions on how to fix the problem?