I've seen a few feeding/misfire problems in pumps and auto loaders caused by a dirty chamber. Outers (others prob too) sells a "chamber brush", basically a nylon brush on a short flexible handle. It is inserted into the chamber still on the action. Gets plastic fouling that keeps new shell from seating correctly,better than a reg. bore brush can, fixing many misfire problems. Either that or you' ve got something wrong on the firing pin end...? Chamber brush is a cheap cure... and handy to have anyway.


BK