Just FWIW, here are the dimensions:
Bullet diameter: .426-.447
Diameter at neck: .444-.452
Diameter at head: .446-.457
Diameter of rim: .492-.508
Case Length: .650-.740
The cartridge dates from about 1868 and was adopted by the RIC along with the revolver. But the first official ammunition issue was in 1892. That round had a 219 grain bullet of 12-1 lead-tin alloy, loaded with 10 grains of black pistol powder. The most common commercial loadings used a 200 grain lead bullet. It was made here by Winchester and in Europe up to WWII, later loadings being smokeless powder. In view of the age of the gun, I recommend sticking with black powder.
Jim
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