One shot stops are a myth. Unless you hit someone in the face or temporal region, or possibly the heart. A 22LR will kill someone if you hit them in those areas.
as others have said, shot placement is everything, the only way to stop a fight in one shot is to hit someone in the spinal cord, heart, or brain. if you hit any of those, caliber is irrelevant. you could shoot someone in the stomach with .50 BMG and they could potentially keep fighting, that would have to be one tough son of a bitch though.
Not to be picky, but the heart isn't a CNS shot. People can and have continued to fight for up to three minutes with their heart destroyed. The brain can continue to function for that long without blood actively being pumped to it.
The reason a Central Nervous System shot can stop a fight is because the brain can no longer communicate with the rest of the body (muscles). The heart shot has more to do with the individuals willingness to fight rather than a disconnect of the brain to the body.
CNS hit = off switch. The triangle shot. Nose, left and right nipples representing the 3 corners and sight picture center mass of triangle. As long as the caliber is enough to make the penetration the rest is acedemic if placement is true. No one keeps going after a CNS disconnect as it is the equivalent of removing head from shoulders or power cord plug from wall outlet. The trick is making that shot (sniper/rifleman) or shots (other less precise small arms). As mentioned the CNS is a rather small target laterally. Hence punches in bunches center mass (of the triangle) especially with handgun cartridges is widely recommended on the theory one of those good shots should make the connection or rather perform the disconnection.
CNS is that Center Nut Shot? I know that would drop me like a rock.
One would be as difficult to accomplish as the other.
I like my chances with a G20 10mm loaded with DoubleTap 135g with velocity of 1600 fps!!!
No problem with over-penetration-It fragments.
10mm is an awesome round but I know I would have trouble with fast accurate follow up shots. Different strokes for different folks. Great round with excellent penetration but I'm one of those who think the FBI got it right moving away from it. Handling that round effectively is not for everyone. Granted my frame of reference is a Glock G20. Would love to give it a go through a heavier Delta Elite or Witness someday.
I was not specific enough when I posed this question, so I will add the specificity now:
This is a Bad Guy target: http://c95946.r46.cf3.rackcdn.com/ca...uy_tgtProd.jpg
Assuming a single shot in the torso K5 zone, what caliber would you consider to reliably deliver one-shot stops?
I had unfairly eliminated the 10MM because so few carry one. But the G29 from Glock is a viable defensive weapon so I will include it now.
In my mind, the one shot stopping rounds are .357 and .45 and the 10mm.
I think any one of these can reliably yield one shot stops. I think the .357 is better than the .45 and the 10mm is more powerful than either providing you are able to reliably put a round in the K5 zone.
That is my opinion.
I was wanting to hear others. But specifically in the kill zone as shown in the bad guy target (link).
If I could only choose ONE gun (between a .357, .45, or 10mm) with ONE bullet I personally would pick up the .45 just because I know I (and most people not all) would be the most accurate with the .45.
The .357 has so much felt recoil to me and when I shoot them I feel like I can't hit a damn thing. The 10mm is a sweet caliber one that I will want to own and try sometime in the future. That would be my 2nd pick...
Personally, I own two 9mms because as many have stated, shot placement is what counts, and the size of the bullet doesn't always matter. 2 in the chest one in the head, double tap...
If you absolutely have to make a close-range, one-shot stop with a torso hit, nothing will do the job better than a 3" cannon loaded with antipersonnel shells.
Of course, you would also need six horses and a six-man crew, but nothing is ever really simple.