FYI, parts are somewhat available for the Martini, but the entire breechblock assembly consists of several parts, including the firing pin, spring, etc. (I just checked and Numrich has some of the parts you need, but they ain't cheap!!)
Kynoch used to load .577/.450 in solid drawn brass cases that wre reloadable with the standard British 6mm Berdan primer (same as the .303).
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