Originally Posted by silverado113
Just had two self defense shootings that killed the perp with.22LR I think 9mm will suffice.
Seriously. I hate the "knock down power" type statements. 9 mill will do just fine. Don't get a 40 thinking it has all this stopping power compared to a 9mm because that is false and irrelevant. I'd personally rather do more damage than knock them down, otherwise you might as well use bean bag shotguns....
Maybe this will help change your opinion on "smaller" rounds. Velocity is a key factor to the overall extent of GSW injuries. According to the kinetic energy equation: (kinetic energy = mass/ 2 x velocity squared) Doubling the mass doubles the energy, however doubling the velocity actually quadruples the energy. Therefore a small-caliber bullet traveling at high speed can produce a more extensive injury than a larger caliber bullet traveling at a lower speed.
With the proper round, you will definitely stop them in their tracks with a 9 banger.