For what it's worth . . .
With that in mind, here are some additional bits of information courtesy of some time I spent with John Farnam:
- All common defensive handgun rounds are puny. Their only genuine utility is that handguns are easily portable and concealable.
- Shot placement is very important, but it's not even close to being any kind of a guarantee.
- The only "guaranteed" stop is destroying the medulla oblongata (brain stem), which is a difficult target for a variety of reasons. Shots to other parts of the brain/spinal column are unpredictable with handgun projectiles, and that assumes that your bullet(s) manage to pentrate the skull.
- No one knows how many rounds it will take to eliminate a given threat, regardless of the caliber and the concept of a "one shot stop" with any handheld weapon is a myth. There are too many variables even if the marksmanships is excellent and the terminal ballistics of the projectiles are as advertised. That's why you have to keep servicing the threat until it's not a threat anymore.
Joseph Viray (aka rhino)
- 97% of the people who are shot in in America survive. That includes suicide attempts. Handguns are puny.
- The most common reaction observed when people are shot is that they run away. That's an excellent outcome for the defender, and if that happens, the rest is moot.
- Incapacitation due to blood loss isn't going to happen instantaneously, regardless of how many holes you put in the threat. I don't recall the quoted figure, but you're looking at a minimum of 20-30 seconds for someone to bleed enough to be incapacitated.