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Compressed air trapped in the hollow cavity of SMK ??

 
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  #8  
Old 01-30-2004, 01:08 PM
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Join Date: Feb 2003
Location: Potter Co. PA
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Re: Compressed air trapped in the hollow cavity of SMK ??

i think the main thing you're seeing is the second reason that meichele described. animals, like humans, are mainly made up of water. as a bullet hits and delivers a shock wave, the water acts as a medium for it to travel throughout the body. the most simple way to test this is with an aluminum can. take 2 out, but fill one completely with water, and shoot them with something small and slow- such as a 38spc. the empty one will just leave a hole. the one with water though will probably get shredded like a piece of paper. obviously a can is not going to let something like a semi-wadcutter expand at all, but its the shock wave that does the most damage. look at picture of a bomb going off. before the firey explosion hits anything, the white ringed shock wave gets to things first, and inflicts the initial damage. thats why i laugh at movies when guys go underwater to avoid explosions. ever see a fish smile when you bang on the side of a fishbowl? water acts as a medium to amplify waves of that type. when a bullet hits the body, the fluid in the body does the same thing.

-brian
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Old 01-30-2004, 01:25 PM
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Re: Compressed air trapped in the hollow cavity of SMK ??

I have seen what Harv mentioned, matter of fact we had a 168 gr. XLC bore along the spine of a mule deer and exit by the tail, and the entire wound channel was filled with hair that had to come in from the entrance location.

When I shoot clay I get a strange vortex looking cylinder inside the wound cavity that also would indicate that the clay materiall is being sucked in behind the bullet.

Terminal ballistics is a very interesting topic.
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Old 01-30-2004, 03:48 PM
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Re: Compressed air trapped in the hollow cavity of SMK ??

If I'm not mistaken, something else must be at work. How about the air mass that is being pushed aside behind the bullet. If the bullet is spinning wouldn't the air partually around it. Sort of like the Matrix when the bullets are causing that vapor trail??
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Old 02-01-2004, 04:03 PM
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Join Date: Oct 2003
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Re: Compressed air trapped in the hollow cavity of SMK ??

air compresses, so I don't think the air around the bullet is doing much of anything with regard to damage. As stated earlier water does not, so a supersonic shockwave that passes through it stretches and tears tissue. One other thing I have noticed is the effect of a bullet on bone, creating a shower of high speed projectiles which can do significant damage on their own.
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Old 02-01-2004, 04:53 PM
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Join Date: Nov 2003
Location: Northern Ontario, CANADA
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Re: Compressed air trapped in the hollow cavity of SMK ??

Harv and Ian; I've seen the same thing you are talking about. As you know we can have once in a life time hunt every year because of our moose and deer in our back yard. The Bullet Manufacturers I've talked to all say a velocity impact on the HIGH END of 1600-1850fps will give a quality expansion. IMPACT IS THE THE WORD and not at the Muzzle. My Lapua needs range, but a new bullet by Nosler in The Accubond seems to be doing it because of the thin jacket and high BC for down range.
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