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 Post subject: My Model 1100 jams when I shoot 2 3/4-inch shells.
PostPosted: Wed May 05, 2004 9:37 am 
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If your shotgun's serial number ends in M, N or U, then you have a 3-inch magnum shotgun and will need to use magnum ammunition.

The magnum barrel only has one gas orifice hole in the gas chamber and a field load will not supply sufficient gas pressure to cycle the action in a magnum barrel. Field barrels, on the other hand, have two orifice holes and are designed for the the lighter 2 3/4-inch loads.

Most Model 1100 Magnum shotguns with the exception of pre-1977 Model 1100 20-gauge shotguns can be fitted with 2 3/4-inch field barrels for use with light field and target loads.

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