The gun, as you state, is a 3 1/2” chamber and it won’t cycle with 2 3/4” ammo It’s not designed to shoot the lighter/shorter ammo. The shorter shells don’t develop enough gas to cycle the gun reliably. Well oiled it will do it sometimes and not do it other times. That’s pretty much normal when you try shooting the much lighter ammo out of that gun. Quite a few 3” chambers will cycle 2 3/4” ammo, but it would be rare for a 3 1/2” chamber to do it. I’ve owned many, many shotguns over the years and have seen this happen lots of times. Sell it and get a gun made for the ammo you want to use in it. Some duck, goose, or turkey hunter will be happy to take it off your hands.
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