My 1890 era 12's measure .750 my 10's from the same era measure .780. After 1900 the 12's measure .730 I don't own any 10's past 1898, but my two 10's from that date still measure .780. I have a 1891 CH 12ga on a #1 frame that measures .750 and still has min walls of .036 (.060 at 9" from the muzzle)and the gun weights 7lbs 4oz exactly to the letter so I believe the barrels are untouched. Just my 2 cents.
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