imported post
Here are some selections from Charles Remsberg,
The Tactical Edge: Surviving High Risk Patrol (Northbrook IL: Calibre Press, 1986; ISBN 0-935878-05-X), Chapter 4
Barricaded Subjects, section
Sniper Control.
The following excerpts assume a sniper with a scoped rifle, except where otherwise stated.
p 221
What you're hoping to sever or pulverize is his brain stem, the "celery stalk" about an inch in diameter that joins the spinal column to the brain. Nerves that control motor function are channeled through there, and the lower third of the stem [the medulla] controls breathing and heartbeat. Hit here, he won't experience even reflexive motor action. His entire body will instantly experience what doctors call "flaccid paralysis"; all his muscles will suddenly relax, incapable of any motion of any kind thereafter.
Regardless of how the subject is positioned relative to you, think in terms of shooting center mass to his head. According to a concensus of medical examiners and forensic pathologists who've studied the incapacitating effects of sniper shots to the head, there are different considerations depending on his head positioning.
A discussion of where to aim from different angles ensues.
p. 225
One quick reading on whether your head shot has been successful is how your target falls. If he goes straight down, limp, or pitches forward, you have high assurance of fatality. If he falls to the side, you're likely only to have partially incapacitated him. Almost never with a high-powered rifle round do you see the Hollywood phenomenon of the target being blown backwards. ...
But wait! There's more ...
In a discussion of center-mass chest shots on p. 227:
The twitching phenomenon can also occur with head shots, if inappropriate ammunition is used. At a Wisconsin barricade, where a young gunman was holding a police chief hostage in a car, a lieutenant in the inner perimeter fired his .45 semi-automatic pistol and hit the suspect in the head. The slug ricocheted around inside his scalp but never penetrated his skull. He was still able to struggle with the chief before a second shot, fired from a .38 revolver achieved penetration. The subject seemed dead, but when officers rushed the car and dragged him out, he still clutched a gun in his right hand ... and all his fingers were twitching. ...
DISCLAIMER: I myself have neither experience nor particular expertise in this area. The only thing I'm doing is presenting what this book says. Calibre Press is a respected LE publisher, but then again this particular book is 22 years old.
As with so many things in self-defense, it seems like something of a crapshoot. Figure your odds and take your choice.
Hope the above is helpful.
regards,
GR
Edited for spelling.