Maybe I’m confused in that the Triple Lock IS Mk I but all commercial brass is MK II as it’s shorter and can also fire in Mk I revolvers, but if Mk I brass was available, it’s versatility is not as great, being only able to service in Mk I revolvers?
I had thought Triple Lock revolvers were Mk II and Mk I came later. I thought I remembered it as such as it was counterintuitive, the reverse of what one might expect???
455 Webley MKII - Large Pistol - Brass Cases
MK #s were always used in numerical order; i.e., the Mk I nomenclature was always first with Mk II and later marks used subsequently for later/improved models or cartridges. Although the 455 triple locks were considered the Mk I by the British, only the 2nd model, the Mk II model was stamped with the Mark #, and stamped Mk II by the British.
Mk I or II for the 455 service revolvers is different and separate from nomenclature for the 455 cartridge Mark #s. In other words the Mark #s for the guns and those for the ammo do not correspond.
Although intended for use with the 455 Mk II cartridge, as posted above, S&W agreed to chamber all the British service revolvers to chamber and shoot the longer semi-obsolete 455 Mk I cartridge for the flexibility afforded under battle field ammo supply issues.
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