It is said that Will Bill Hickok shot Davis Tutt during a gunfight in 1865 from about 75 yards with a cap and ball 1851 Colt Navy Revolver.
Yep.
Most of the Wild West gunmen were just killers, often shooting unarmed people or helpless people (Hardin).
Wild Bill was the real deal and their was a reason the bad guys were afraid of him.
Hickock used a caliber smaller than .40.
I guess he had not read all the experts writings in the latest gun magazines.