Speaking of Smith Carbine and the 1859 - 1863 model Sharps
Both will shoot bulk powder paper cartridge or their own special brass cartridge.
But these brass cartridges are not like modern center fire.
These are much much thicker walled.
The Smiths protrude farther out of the chamber than the Sharps making it easier to grab them.
These never need resizing, so they would last just about forever,
Bulk the rifle will hold about 80 gr of powder. the brass shells only about 50 to 60 grains.
But because you can slightly compress the powder in the brass case, you get an equal and maybe even bigger bang with them.
Both are fun to shoot.
The Smith is slightly smaller, more compact.
On the sharps be careful where your fingers are when closing the breech. That lever can really hurt when it snaps down in the locked position.