Before metallic cartridges came along revolvers could be loaded with paper cartridges. Take a piece of paper similar to cigarette paper. Roll it onto a tapered tube where the mouth is the size of the ball/bullet, using a tapered dowel as a mandrel and glue the edge.
When the glue is dry, use a Q-tip to put a little glue around the front of the tube about 1/8 inch wide and insert the ball or bullet. When everything is dry pour in a charge of powder, twist the back of the tube and tie it off with a thread,
To load, insert the cartridge into the chamber, base first, and ram it home. The paper at the back will rupture, spilling a little powder into the bottom of the chamber. Cap the chamber, and fire. You don’t have to extract/eject any case because the paper will burn up.
Cartridges were carried in cartridge boxes made out of leather with a wood block inside. The block was drilled with holes the size of the cartridge, and protected them from jars and blows.
Muskets were loaded with similar cartridges, but the loading procedure was different. A soldier would rip off the end of the cartridge with his teeth, pour the powder down the barrel, and then ram the remains of the cartridge with the bullet down the barrel.