PW,
Can anyone think of a movie (A Western would be better than a crime drama, which I seldom watch.) where these guns appear? Or better yet, where one is shown being used. (close up, not some guy on top of a mountain)
In almost all western films, a single action revolver is the gun used. In almost all cases it is the .45 Colt.
There are a lot of later variations.
In "Dirty Harry", Clint Eastwood used a revolver in caliber .44 magnum. One of the most powerful of all handguns.
I carry a .40 s&w. Made from a 9mm expanded to 10mm, or close.
But in a semi automatic.
The difference?
Most revolvers hold five or six shells.
Most semi autos hold more.
Have fun,
Phil