The M1870 Vetterli was the Italian service rifle from 1870-1887, when it was gradually replaced with the M1870/87 Italian Vetterli-Vitali variant. The M1870 was a single-shot bolt action rifle chambered for the 10.4mm Vetterli centrefire cartridge, at first loaded with black powder and later with smokeless powder. This rifle's bore measures .430" - same as .44 S&W Russian/Special/Magnum. I ran a .348 case into a .44 Mag sizer die until a second shoulder was formed where it needs to be to fit into the Vetterli chamber.
Antique Military Rifles (Pre-1899) Non-US Issued, Black Powder, Metallic Cartridge, Military Rifles - FOR SALE - Buyers NOTE: These Rifles are sold as collectors' items only. I strongly recommend that they be inspected and approved for shooting by a competent gunsmith.