its hard to pin down one specific make/model, and i'm sure it has changed over the years. with that said, i think its fair to say that the .38 special revolver has probably been used in more hits/murders than most other weapons. its reliable, and doesn't expel any casings which could be used to gather forensic evidence.
I think this would be a good choice. A good bit more stopping power than a .22 and the revolver won't jam like a semi-auto.
