Thank you gentlemen. The Canadian owner added this: "The British contribution may be correct or not, regarding the cartridge . I have the 577 BPS 3 1/4[overall length, the brass is 2 3/4 in] and it is correct [although it is a Nitro cartridge, same size]."
It looks like the rifle cartridge is the correct size. But the gun was not proofed for nitro when it was rechambered, which in and of itself would date the conversion to between 1887 and 1896. I still can't help him much on value....It looks a rare gun but not collectible?
Last edited by Argo44; 11/07/22 03:09 PM.
