I would be curious if anyone has seen the results of shotgun barrels that have failed proof testing. It would seem to me the opertunity to budge a barrel during the proofing is elevated. The data of guns tested would provide us with results in a controlled situation of what might happen to shotguns fired with proofing shells. My understanding is that these shells are loaded to about double the normal charge. I realize dents, wall thickness, and other variables would effect the results, but still there should be patterns of barrel bulges.
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