We saw a fairly new Italian over under rupture forward of the chambers at the Southern about ten years ago. He was using Winchester trap handicap gold loads that would have been loaded to SAAMI max.
I have an acquaintance who had a Guerini rupture halfway down with factory handicap loads. He saw the shot cup fly out on the previous shot so it was not a squib and stuck wad issue. He later had the barrels measured, bore ID was standard but the wall thickness was less than .020, how far less I don't recall but they were made surprisingly thin.
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