If it is a three inch chamber then the barrel will have only one port. 3 inch 1100s will not function with light shells. 2 3/4 inch 3 3/4 dram shells usually function. Anything lighter will not. Make sure the gas hole in the barrel is clear and the magazine tube doesn't have a powder build that binds the action.11-87 Remington magnum, it runs fine with everything but the 2.75 shells .
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