I believe that all common, but perhaps not specialty, factory loaded 16 gauge shotshells be they high or low brass operate in the 10,000 to 11,000 PSI range some even higher. Personally I avoid them in any of my older shotguns, Damascus or steel, more to avoid stress on the frame than any other reason. Although I've not experienced it I'v seen cracked frames on older guns from shooting modern high pressure shotshells.
Just my $0,02 for what it's worth.
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Proud father and grandfather of United States Marines!
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