SlowFuse
Member
For the 1858: 18 to 20 grains of 3F with a good fitting ball will produce good results, usually .454 but sometimes .457. A 9mm case full of cream of wheat on top of the powder fills the gap of the low charge. Grease on top of the ball or a thin lube/fiber wad between ball and powder keeps you shooting longer.
For the Navy 12 to 15 grains of 3F with a .380 ball, possibly a .375 ball will be your load, same as before fill the gap with cream of wheat on top of powder charge. I use a 32 ACP case full of filler for the .36 and then ball with a 50/50 mix of Crisco and beeswax on top. Not familiar with Rigarmi cylinder measurement specs, they all vary by brand/year especially older model c&b's. With current production Pietta a .375 ball will work, Uberti 36's seem to prefer a bigger (.380) ball to shave a ring. @Captain*kirk and I share the same sentiment, all of them are different. Takes a bit of development to get those ten ring groups.
For the Navy 12 to 15 grains of 3F with a .380 ball, possibly a .375 ball will be your load, same as before fill the gap with cream of wheat on top of powder charge. I use a 32 ACP case full of filler for the .36 and then ball with a 50/50 mix of Crisco and beeswax on top. Not familiar with Rigarmi cylinder measurement specs, they all vary by brand/year especially older model c&b's. With current production Pietta a .375 ball will work, Uberti 36's seem to prefer a bigger (.380) ball to shave a ring. @Captain*kirk and I share the same sentiment, all of them are different. Takes a bit of development to get those ten ring groups.