[Rockhound]

The article mentions that an 1860 Colt caused the wound.

The cap and ball revolvers used during the civil war era didn’t use cartridges. You poured a measured charge of black powder into each cylinder, then placed a round ball on top. The ‘ramrod’ is permanently mounted to the gun, under the barrel, and was used to seat the ball in the cylinder.

Follow this up with a dab of grease over each ball, to lubricate and also to prevent multiple cylinder discharges. Cap each nipple at the back of the cylinder with a percussion cap, and the gun is ready to shoot.

[Pilsner]

The cap and ball revolvers used during the civil war era didn’t use cartridges. You poured a measured charge of black powder into each cylinder, then placed a round ball on top. The ‘ramrod’ is permanently mounted to the gun, under the barrel, and was used to seat the ball in the cylinder. Follow this up with a dab of grease over each ball, to lubricate and also to prevent multiple cylinder discharges. Cap each nipple at the back of the cylinder with a percussion cap, and the gun is ready to shoot.

As the song The Devil's Right Hand says:

My first pistol was a cap and ball Colt,
shoot as fast as lightening, but she loads a mite slow..