^ So, "fastest" is arguable from that standpoint, too, right?
The critical CNS shot is always, demonstrably,
objectively going to be the on/off switch, from a physiologic point-of-view.
Critical amage - i.e. otherwise mortal wounds - to peripheral structures will still allow the wounded to continue to fight (providing that they have not decided to quit due to a "psychological stop") until their blood pressure can no longer support consciousness.
In a very concrete way, we can see the truth of the physiology in both the presentation by Dr. Grabinsky (
https://www.thearmorylife.com/forum/threads/does-the-cartridge-still-matter.10166/#post-134402 - opening citation, pertinent portion of the video starting at the approx. 13 minute time-point), and again in the Gramins/Maddox shootout -
Officer Tim Gramins let loose with a barrage of rounds hoping that what he might lose in accuracy would be compensated for by its suppressive nature. The only thing separating Gramins and his assailant was a windshield that was fast disintegrating from ingoing and outgoing rounds.
www.policemag.com
And from the opposite end of the spectrum, we have the inspiring story of Sgt. Stacy Lim of the LAPD: her heart was perforated by her assailant's round, and she "died on the table," yet prior to falling, she had managed to defeat her assailant and scatter the rest of his accomplices.
"Center-(of exposed)-mass" is where we are trained to engage not because it's the "fastest" way to shut-down the threat physiologically, but because it gives us as the shooter the best odds of making our hits when we are, ourselves, under critical stress and when both we as well as the threat(s) are in dynamic motion.
Extending this to the complete presentation (thus exposure) of the threat's body, we arrive at "high-center-chest" not as it's the true "center-of-mass" of the human body, but because this area offers us the best chances to effect critical damage to the lethal-force aggressor's anatomy -that of the heart and the great vessels, and to a lesser extent, the lung fields surrounding it- so that hypovolemic shock contributes to taking them "out of the fight." But physiologically, the blood-loss necessary to effect a true physiologic-stop is arrived-at only via the passage of time.
I get what you mean,
@Bassbob , and I don't disagree: high-center-chest is our best bang for the buck, so to speak. In shooting reactively (i.e. "reactive" to the reactions of the threat), the "NSR" of repeated, rapid, successive shots to high-center-mass, continued until the threat is no longer aggressing certainly is the way to go. But in understanding human physiology, we must consider that even massive -mortal- trauma to that area still is bound to the laws of physics and biology, and will allow a determined threat to continue the attack until his or her body can no longer supply sufficient blood to the brain to keep it conscious.
Physiologically speaking, the fastest way to shut things down is the critical CNS shot.
-----
The SIG Sauer academy is perhaps the best-known "all-in one" in that area:
www.sigsaueracademy.com
I have a few personal friends who have taken a few of their course offerings, and all speak nothing but praise of both the facility and its cadre.
It would be a great place to not only get started, but to also start networking contacts with fellow students/shooters.
To build your "tribe," as the late Pat Rogers was fond of encouraging of his students.
