Tuco could not have picked a part from here and a part from there (different types of guns) and put together a cartridge revolver, but if the right parts were there he could have assembled one (if he knew how). However, if all the parts needed were there they would probably have already been assembled into a gun. It was actually a fairly complicated process to do the conversion (factory equipment and assembly required, or a *good* gunsmith)).
Colt made a number of cap-and-ball to cartridge conversions in the late 1860's and early 1870's. These went by such names as the Theur and later Richards-Mason conversions for 1860 (Civil War) percussion Colts. Earlier 1849 pocket pistols were also common conversions. Colt had a LOT of parts for those and wanted to sell them as completed guns.
As long as the caliber (diameter) of the bullet is made the same as the round ball it would make no difference in pressure or durability since both (percussion or cartridge) were propelled by black powder. In fact, you could get conical bullets for the original percussion pistols, they were just not as common as the round balls.
It might be of interest that Colt could not make cartridge firearms until 1872 since Smith and Wesson held the Rollin White patent for through-bored cylinders, which was issued in 1855. (17 year patent life in those days).
Colt made a number of cap-and-ball to cartridge conversions in the late 1860's and early 1870's. These went by such names as the Theur and later Richards-Mason conversions for 1860 (Civil War) percussion Colts. Earlier 1849 pocket pistols were also common conversions. Colt had a LOT of parts for those and wanted to sell them as completed guns.
As long as the caliber (diameter) of the bullet is made the same as the round ball it would make no difference in pressure or durability since both (percussion or cartridge) were propelled by black powder. In fact, you could get conical bullets for the original percussion pistols, they were just not as common as the round balls.
It might be of interest that Colt could not make cartridge firearms until 1872 since Smith and Wesson held the Rollin White patent for through-bored cylinders, which was issued in 1855. (17 year patent life in those days).