Gonna be ciphering out the best way of approaching this caliber, chambered in a Remington-Lee 1885. Don't mind sticking to black powder (or substitutes), but I have never messed around with these bottlenecked rounds before. Not even altogether sure what version of the spanish cartridge it is; the chamber LOOKS necked rather than tapered, and the bore is right at 0.431" w/ calipers at the muzzle. Haven't jumped in w/ both feet yet!

Any words of wisdom here?
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