Try a fired hull?
I would take a fired 2 3/4" hull, make sure the crimp is well opened up, and gently chamber it by hand to see how it "feels"
Obviously if a fired hull chambers easily and fully it would at least be an addl. clue, not the definitive answer.
Have a gunsmith measure the chamber. Given the price of barrels for a model 12 I would be talking to the smith about extending the chamber if it is indeed short.
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ricklin
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