Going to jump in here for some advice. I just got a 1875 W.C. Scott 12b hammer gun that look in very good cosmetic condition. Ahead of the flats are the three proofmarks and also each barrel is stamped 14. I assume it was a 12 bore proofed at 14 bore.
Using OD-ID/2 I get both barrels with 0.70 wall thickness 9" from the breech and 9" from the muzzle I get .050 (rt) & .040 (left).
The bores are consistent along the barrel, .710 (rt) and .718 (left). The chokes are actually negative, the right barrel opens up .009 and the left opens up .002.
So this tells me that if it was proofed at 14 bore, .693, then the barrels have been honed out .017 (rt) and .025 (left).
But with those wall thicknesses (.070 9 inches from the breech) and everything else being sound would you consider it to be safe with low pressure or blackpowder loads? The barrels are quite heavy, the breech walls are between 0.235 and 0.248 depending on where on the circumference they are measured.
Amazing thing is that for a 138 year old gun the stock has shootable dimensions.
thanks,
Rob
