Both the 1851 Colt Navy and the 1860 Army were used in the West in significant numbers after the Civil War
whether they were in original black powder form or conversions to cartridges before the Colt 1873 Peacemaker
and other cartridge revolvers replaced them with time. The Colt Navy was a useful firearm in the hands of a
skilled shooter, like Wild Bill Hickok who carried a pair of Colt Navy revolvers for most of his life and killed Davis
Tutt in 1865 after the war in Texas with a shot at seventy five yards during what is considered the first classic
Wild West gunfight.
I agree with everything you said except I believe "Wild Bill" killed Davis Tutt in Springfiled MO., not Texas