Texas Shooter..Finally made it to the range and the third time back to Mossberg fixed the problem. It was, as Lazy Eyed Sniper suspected, the shell stop. The button had a definite click in it and would stick down sometimes. Now it's very smooth. Cycles Winchester 1200fps target loads and Federal and Fiocchi 1125 reduced recoil buckshot with no failures. Right now the mag spring is stock and it will only hold 7+1 but that will be fixed at the next range session. Valvestem's suggestion to contact Joe Zahker is good advice. E-mail is best way to contact. jzakher@maverickarms.com