Ah but that wouldn't be historical fun
Potassium Nitrate...hot water, correct size dowel rod and cigarette papers. You need to be extra careful if you've never done this. These have a chance of leaving smoldering traces of the papers in the chamber which could ignite the next cartridge you load. Causing obviously hand/finger damage or removal.
I make them up un-nitrated for ease of caring a cartridge box full...bite (or rip off
) the powder end, the place the bullet over the chamber for ramming... ripping off the remaining paper of as you seat the ball.