Old cartridges
There were quite a few. Both S&W and Colt had rounds with their names on them. Some were interchangable, others were not. And the words "short, long, extra long, New Police, Special, etc. were on the ends of the names.
Cartridges of the World was mentioned, and is the standard reference for most of us. 95% of cartidge questions, the answers will be in that book.
Today's guns are much more efficient, but actuall kill fewer of the people shot than the guns of yesterday. Before penecillin and x-rays, most gunshots were ultimately fatal. The most feared gun in the old west was the .41 Rimfire derringer. Just enough power to go halfway through a man. The old outside lubricated bullet carried all kinds of stuff into the wound. It was a sure killer (they said), but unless you were VERY lucky, you could take a week or two to die!