all that did was speed it up , 2 3/4 steel in a full choke old gun will do the same one day may be 1 round may be 100 but there is a reason guns have proofs and its that they are proofed to a pressure and have a built in safety level , new steel shot is way over the pressure that some old guns can handle .
the 3 inch is more likely to corse it to split at the chamber . as the crimp opens there is no room for it and you get a spike and split the chamber in your face ( what i was hopping would happen)
but this gun held and bulged at its weakest point , then fully failed next round
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