The S&W New Model No.3 was factory chambered in .45 calibre, for the following cartridges: .45 S&W Schofield, .450 Revolver, .45 Webley, .455 Mark I, and .455 Mark II.
Case length in my NM3 chamber looks to be about 1.1". Case length of my .455 MARK II is about .78". Case length of .450 Revolver is listed as .69".
I can use my .455 Mark II cartridges, as they do chamber, but it is like shooting .22 shorts in a .22 long rifle chamber.
I would like to shoot the correct cartridge in my NM 3, so I am still looking for an empty .45 S&W Schofield cartridge case to confirm it will chamber in my gun.
Regards