blackpowder shot gun guage help

[wleggart]

[/URL][/IMG] This shot gun is new and unfired condition. IT has been a closet queen for years. Navy ARms 219 between the barrels, percussion, under the forend between the barrels is: 10 and there are proof marks on the end of the barrels where the nipples are. There is no serial number. There is a National Wild Turkey Federation insignis inlet into the stock, and 1973-1983 Commerative Edition engraved on the barrels. I do not have a caliper, but with a ruler the barrels appear to be just under .750" ID, and to my eyes they are both that dimension. Is the a 10 gauge? I need to order some over powder and over shot wads. I have a sack of #6 lead, and plan to load equal shot and Pyrodex by volume. I would appreciate some experts chiming in. Bill

 

[Chawbaccer]

I think it is a 10 guage. A 10 bore diameter is .779 and a 10 modified choke is .759.