I have measurements for a c. 1895 F grade 10g, Plain Twist, found in the rafters of a shack in Idaho, which Jent now has.
End of chamber .174" and .167"
9" from breech .095" and .092"
9" from muzzle .052" and .050"
MWT was .050" 6" from muzzle
Obviously significantly thicker than a 12g barrel, which should be reassuring regarding load pressure.
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