What is the stopping power of 0.22 magnum caliber?

ONE- and I emphasize ONE set of numbers gives the .22 magnum a 42% rating for a "one shot stop", when fired from a 6.5 inch barreled revolver. Compare to a rating of 78% for a .38 Special from a 4 inch barrel, or 96% for a 125 gr .357 Magnum, 4 inch barrel. The .22 Magnum can be a fairly LETHAL round, but does not have a great deal of immediate stopping power (ability to incapacitate an opponent immediately).