What brand of percussion caps, what powder, and what brand of mini-balls
You''ll need 'musket' caps and the CCIs are the most common.
The Hornady 'Great Plains' bullets are the best hollow base conicals for it and are incredibly accurate in both of my rifles. Your '64 should be a .58 cal and the ones in the pic are .54 for my Renegade but the same bullet.
You can use round balls in these rifles but that a different subject and conicals are easier to load as they do not require a patch and lube.
As far as powder is concerned I 'weaned' myself off of real black powder many years ago and tried Pyrodex. There are MANY substitutes available but in a traditional (or replica) BP rifle Pyrodex is the replacement for BP. Many of the other substitutes are meant for in lines that use 209 shotgun primers for ignition and will not ignite consistently with traditional percussion caps.
Pyrodex 'P' is the equivalent to the '3F' granulation of black powder that is used in this caliber of rifle. Understand however Pyrodex is not necessarily cleaner than black powder but does not build up as fast in the inside of the barrel and on the outside around the breech. I can shoot many more rounds before a barrel swab than with black powder and while not cleaner, it CLEANS up faster than black powder - and the biggest advantage - it will be available where BP is sometimes unobtainable.
The max charge for a Springfield 61/63/64 was 60 grains of BP but I would probably start with about 40 in that rifle - and most likely stay there.
If you are unfamiliar with any of this get an experienced muzzleloader shooter to help you or follow the instructions for such in a KNOWN, quality reference such as the ABCs of reloading or other reloading manual that outlines loading muzzleloaders.
Someone else jump in any time!
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