as to the original posting, why was the 44 caliber cartridges of the 1800s not used by the federal government.
1. these 44 caliber cartridges did not meet the basic requirements of the government contract for the solid frame revolver.
-not the same bullet diameter, or powder charge as used by at minimum the colt 1860.
2. ease of use in the field. straight walled cartridges have a small ability to clean themselves when they get inserted into the chamber. its why most people use a once fired cartridge case to clean out chambers when a special is used in a magnum..
3. ease of manufacturing