Which firefight statistics were the basis for RPG statistics?, historical % one shot stops by caliber stats? Options

[Wounded Ronin]

Yesterday I took a one day class to qualify for a concealed firearms permit. In the morning while we were waiting everyone to get signed in, the instructor popped in some old Paladin Press (infamous for publishing Ashida Kim's books) VHS tape about "stopping power", which went on and on about how apparently some historical cops went ahead and made a big statistical table rating all kinds of handgun cartridges by the percentage of times someone being shot by the cartridge resulted in a "one shot stop".

Was this the body of statistics that had been used for the Cyberpunk combat engine? For the Pheonix Command lethality tables? Because my first thought was, "Goddamn, I have to get ahold of those statistics so that I can make a role playing game with firefights based on those statistics!" Then I realized that's probably exactly what the Cyberpunk and Pheonix Command people had done, and that's probably why the statistics in Pheonix Command are slightly odd, like there being no difference in random chance of killing you whether you're hit by 9mm parabellum or .45 ACP.

Be that as it may, I still think we totally need a RPG system where every time you're shot it's a random chance of killing you, or else being a non-debilitating wound, with each subsequent shot raising the probability a little bit due to rising levels of trauma.