Phil,
They may not have been honed. How does the interior of the barrels look. If it has mirror bore, then I would say honing was likely, but I can not imagine why anyone would go to the trouble of honing the Decarbonized steel barrels. If the gun barrels have obvious pitting commensurate with an Early, Back Action Parker that had a fair bit of use on Ducks and Geese, then it is most probably in original state. The .780" bore diameter is a proper bore size for a 10-gauge Parker. I think the gun was most likely finished as a 10 gauge Parker and chambered for the Parker 10B brass shotshells. In the 1869 and 1872 catalogs, Parker advertises theur guns in 10- 11- and 12-Ga and they were generally sold with the Brass shells. By the way, have you checked the constrictions at the muzzle to see about the chokes?
Yours
Richard
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