Gun will not cycle 2 3/4" magnum shells reliably. It is mostly a single shot when using these, occasionally it will cycle 2. It has fired thousands of shells. I never have any problems till I try to use 2 3/4" 1 3/8 oz loads. I have shot hundreds of 2 3/4" 1 1/8oz loads with no problems. It shoots 3" and 3 1/2" loads flawlessly. My cousin has the same gun and his does the same thing....not as bad as mine but about every 5th shell