I've sent it off to a gunsmith to check it out, also to have the barrels honed and polished as there was a fair amount of pitting in the bore. I will ask if he can send me pictures when he takes it apart. As far as proof on the barrels, I believe this was only proofed for black powder, not nitro. Is that correct? It's my understanding that mild (6Kish PSI) smokeless loads with 3/4 to 7/8 oz shot are still safe in guns like this.