First do not use anything but black powder. I am not familiar with Cleanshot but just wanted to make it clear since you didn't mention that what you have is black powder. Modern smokeless powder will blow your gun (and your hand) into pieces. If it is black powder FF or FFF will do fine.

Are these reproduction or original guns you plan on using?

What size are your minie bullets? It is possible that the same bullet will not fit both guns.

You have to lube the bullets.

There are lots of pitfalls you can run into when shooting black powder muzzle loaders with no experienced help. You may want to visit this site for better information.

http://www.n-ssa.net/phpbb/