Part II of "Requirements for replacements of currently issued 5.56 M-855 and 7.62 M-8

[JASmith]

...A better measure is his % actually incapacitated by one shot:

[INDENT]Rifle 80%[/INDENT]...Any bullet will "incapacitate" by killing; it's when a torso hit is not immediately fatal that incapacitation becomes important.

The qualifier for "actually incapacitate" is that the shot hit the head or torso. Consider the .25 ACP statistic for example:[indent]

% actually incapacitated by one shot (torso or head hit)- 49%

[/indent]
This tells me that a hit in the torso or head takes one out of action about half the time or better, even with a pipsqueak caliber/cartridge. The issue is how the statistics were derived.

The questions you raise are best resolved by sending them to the author of the study. He might even have a soft spot where things Grendel are concerned...

In the meantime, this is the best set of statistics I've seen in the open literature.

The pucker factor for a 7-yard shot is a lot greater than it is for a 500 meter shot. So, in my view, the 9mm (or M1 Carbine) equivalent threshold is best applied at some distance from the shooter.

So, struggling for an understandable description, one could say that: "The wound channel for a gel target hit at 500 meters must be at least as large in major cross-section and depth as that of a 9mm FMJ hitting the same block 1.5 meters from a block of the same specifications."

I would happy to replace "M-1 Carbine" for "9mm" in the above.