Smokeless powder was introduced somewhere around 1896 and by 1900 was overtaking black powder. You should be able to find many reloading recipes on the various powder websites. You could also use standard commercial ammo out there as well, IF your revolver is in good working order.

Some popular target loads can be had with lead wadcutter bullets and fast burning shotgun powders like Clays, Bullseye, Unique, etc.

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Gary
SWCA 2515