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Shouldn't be any reason to retire it - a smith with the proper gauge can tell you in 30 seconds what the chamber size is. Again, a few now and again is one thing - if you were to start shooting sporting clays and using some uber-fast FITASC loads, that's another thing entirely. I would look into the Vintager type loads, even if the chamber is 2-3/4 - they'll treat your gun (and your shoulder) a little more gently
Enjoy it!
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