I’ll just stick with a Howell .45 Colt cylinder. They make a .45 ACP one as well, if you’re already setup for that one. The Belt Mountain replacement base pin simplifies things a bit.
Since it’s not safe to load 6 in the Howell and dry firing can damage the firing pins, it’s a good idea to keep a snap cap in one chamber. An orange plastic one can be seen through the little window and makes lining up the dead chamber under the hammer easier.