Quote:
Originally Posted by Phillip Carr
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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Phil, In proof testing, they use a shell of the proper length for the chamber.
I think the type of hull has something to do with what happened to Steve's gun. Many, but not all, plastic hulls are skived, and this tapered wall section of the crimp portion may blend with the forcing cones so that the wad doesn't meet with a strong resistance. I don't have to worry about what the chamber length is when I decide to shoot a particular gun that doesn't get much use, because I only load, and only buy 2 1/2" shells.
I think quality Damascus barrels, in good condition can easily tolerate higher than our normal pressures, but maybe not so well when a shell too long for the chamber, is thrown into the mix.