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Old December 9, 2012, 04:23 PM   #21
Frank Ettin
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Join Date: November 23, 2005
Location: California - San Francisco
Posts: 6,774
Quote:
Originally Posted by ltc444
Frank were are your three valid sources.
[1] One source on the issue of psychological stops can be found in this study by Greg Ellifritz.

As Ellifritz note in his discussion of his "failure to incapacitate" data (emphasis added):
Quote:
Originally Posted by Greg Ellifritz

...Take a look at two numbers: the percentage of people who did not stop (no matter how many rounds were fired into them) and the one-shot-stop percentage. The lower caliber rounds (.22, .25, .32) had a failure rate that was roughly double that of the higher caliber rounds. The one-shot-stop percentage (where I considered all hits, anywhere on the body) trended generally higher as the round gets more powerful. This tells us a couple of things...

In a certain (fairly high) percentage of shootings, people stop their aggressive actions after being hit with one round regardless of caliber or shot placement. These people are likely NOT physically incapacitated by the bullet. They just don't want to be shot anymore and give up! Call it a psychological stop if you will. Any bullet or caliber combination will likely yield similar results in those cases. And fortunately for us, there are a lot of these "psychological stops" occurring. The problem we have is when we don't get a psychological stop. If our attacker fights through the pain and continues to victimize us, we might want a round that causes the most damage possible. In essence, we are relying on a "physical stop" rather than a "psychological" one. In order to physically force someone to stop their violent actions we need to either hit him in the Central Nervous System (brain or upper spine) or cause enough bleeding that he becomes unconscious. The more powerful rounds look to be better at doing this....
Also, see the FBI paper entitled "Handgun Wounding Factors and Effectiveness", by Urey W. Patrick. Agent Patrick, for example, notes on page 8:
Quote:
...Psychological factors are probably the most important relative to achieving rapid incapacitation from a gunshot wound to the torso. Awareness of the injury..., fear of injury, fear of death, blood or pain; intimidation by the weapon or the act of being shot; or the simple desire to quit can all lead to rapid incapacitation even from minor wounds. However, psychological factors are also the primary cause of incapacitation failures.

The individual may be unaware of the wound and thus have no stimuli to force a reaction. Strong will, survival instinct, or sheer emotion such as rage or hate can keep a grievously wounded individual fighting....
And for some more insight into wound physiology and "stopping power":
Quote:
  • Dr. V. J. M. DiMaio (DiMaio, V. J. M., M. D., Gunshot Wounds, Elsevier Science Publishing Company, 1987, pg. 42, as quoted in In Defense of Self and Others..., Patrick, Urey W. and Hall, John C., Carolina Academic Press, 2010, pg. 83):
    Quote:
    In the case of low velocity missles, e. g., pistol bullets, the bullet produces a direct path of destruction with very little lateral extension within the surrounding tissue. Only a small temporary cavity is produced. To cause significant injuries to a structure, a pistol bullet must strike that structure directly. The amount of kinetic energy lost in the tissue by a pistol bullet is insufficient to cause the remote injuries produced by a high-velocity rifle bullet.
  • And further in In Defense of Self and Others... (pp. 83-84, emphasis in original):
    Quote:
    The tissue disruption caused by a handgun bullet is limited to two mechanisms. The first or crush mechanism is the hole that the bullet makes passing through the tissue. The second or stretch mechanism is the temporary wound cavity formed by the tissue being driven outward in a radial direction away from the path of the bullet. Of the two, the crush mechanism is the only handgun wounding mechanism that damages tissue. To cause significant injuries to a structure within the body using a handgun, the bullet must penetrate the structure.
  • And further in In Defense of Self and Others... (pp. 95-96, emphasis in original):
    Quote:
    Kinetic energy does not wound. Temporary cavity does not wound. The much-discussed "shock" of bullet impact is a fable....The critical element in wounding effectiveness is penetration. The bullet must pass through the large blood-bearing organs and be of sufficient diameter to promote rapid bleeding....Given durable and reliable penetration, the only way to increase bullet effectiveness is to increase the severity of the wound by increasing the size of the hole made by the bullet....
  • Urey Patrick was in the FBI for some 24 years, 12 of which were in the firearms training unit where he rose to the position of Assistant Unit Chief. John Hall is an attorney who spent 32 years in the FBI, including serving as a firearms instructor and a SWAT team member.
[2] The circumstances of the 1986 Miami FBI shoot-out are fairly well known, but there's a good discussion in a Wikipedia article. An abstract of Dr. W. French Anderson's forensic analysis can be found here. And this (Part 1 and Part II) FBI training video on the subject is interesting.

From the Wikipedia article:
Quote:
....As Platt climbed out of the passenger side car window, one of Dove's 9 mm rounds hit his right upper arm and went on to penetrate his chest, stopping an inch away from his heart. The autopsy found Platt’s right lung was collapsed and his chest cavity contained 1.3 liters of blood, suggesting damage to the main blood vessels of the right lung. Of his many gunshot wounds, this first was the primary injury responsible for Platt’s eventual death....
From the Anderson article:
Quote:
...As Platt crawled through the passenger side window, one of Dove’s 9mm bullets hit his right upper arm, just above the inside crook of the elbow. ....The bullet exited the inner side of his upper arm near the armpit, penetrated his chest between the fifth and sixth ribs, and passed almost completely through the right lung before stopping. The bullet came to a rest about an inch short of penetrating the wall of the heart.
...


At autopsy, Platt’s right lung was completely collapsed and his chest cavity contained 1300 ml of blood, suggesting damage to the main blood vessels of the right lung. Dr. Anderson believes that Platt’s first wound (right upper arm/chest wound B) was unsurvivable, and was the primary injury responsible for Platt’s death....
[3] In my prior post I linked to the source of the information on Stacy Lim.
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Last edited by Frank Ettin; December 10, 2012 at 12:44 AM. Reason: correct typo
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