"Weren't the Colt skins cartridges only for rifles? I haven't seen them any other way...."
Nope, revolver as well.
Colt also offered revolver cartridges with powder that was coated with colloidon. Ramming the cartridge into the chamber broke the colloid layer and allowed the round to fire.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.