Bringing this back to the top. Jay and several others were discussing barrel wall thickness back then.
Since then, Jay and I spent a while measuring barrel walls while at a gun show. I can vouch they they would be nominal diameter for the gauge yet we clearly saw some small bores with factory thin barrels. I concluded that small bore guns, the 20's and 16's were best for standard pressures for the gauge, but with the thicker barrel walls in the 12's , you had more of a safety margin for greater barrel pressures.
More reasons to know your barrels.
Drew posted a picture of a burst fluid steel barrel in the other thread. Just going on the visual, those barrels don't look thin to me.
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