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Long Range Hunting & Shooting
Hydrostatic shock, what's your opinion?
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<blockquote data-quote="Pdvdh" data-source="post: 340630" data-attributes="member: 4191"><p>Hydraulic shock or Hydrodynamic shock would probably be better descriptors.</p><p></p><p>I read an article written by Jim Carmichel (used to be - maybe still is - Gun Editor with Outdoor Life). In his article, he presented the findings of bison or cows that were culled with high powered center fire rilfes on a ranch setting. These animals were center-shot through the rib cage with broadside hits, best as I remember. A person might be able to do a Google search and find the article. These animal's reaction to the bullet were observed and recorded. After the cull, veterinarians performed pathological examinations (autopsy) of the animals. Some percentage of the animals dropped at the shot - instant lights-out deaths. Others died over variable periods of time, same as big game animals do in response to similar bullet hits. The interesting part? All of the animals that expired instantly were observed to have suffered massive strokes. Vessels and arteries ruptured in their brains, and it was more or less concluded that the hydraulic pressure peaks that were transmitted through the blood vessels and arteries overpressured and ruptured arteries/vessels in the brain. Mr. Carmichel surmised that if the timing of the bullets impact coincided with the peak animal blood pressure that the added hydraulic pressure might be enough to kill by massive stroke. While another animal stuck very similarly, but when blood pressure was at a lower level might avoid massive stroke, and not produce an instant body-slam kill. </p><p></p><p>I've hunted for a long time. Seen quite a number of large game harvested by bullet. I have no doubt that high velocity impacts (with bullets of weight reasonably proportionate to the size of the game animal) can cause immediate death. Death can be so instantaneous that I personally concluded that bullet impact caused shock must be disrupting or short circuiting the nervous system. Then I read the Carmichel article. I'm not completely sold on that explanation, but the Vets carefully autopsied all of these animals shot during this study, and massive brain strokes were observed on the ones that collapsed dead on their feet.</p><p></p><p>The most dramatic instant death from a solid body hit I ever observed was a large boar brown bear I shot from a distance of 130 yds with a 338 Imperial Magnum. I used 225 grain Trophy Bonded Bear Claw bullets, one of the Jack Carter bullets before the company was sold to Speer. A 338 Imperial Magnum is virtually identical to the 338 Edge. This bear was standing broadside. I aimed center of the ribs just behind the front shoulder muscles. He collapsed so quickly I missed most of it due to rifle recoil. The way he dropped, and without so much as a twitch on the ground, I thought I might have brained him. This bear was standing on three feet of snow pack, and he was completely visible from my position. He squared 10' 5" and I could only estimate his weight at around 1000-1100 lbs. I couldn't believe a lung shot could put down a 1000 plus pound bear - instant lights out - like that. Because of these doubts, I waited and watched for a good 15 minutes before even getting up from my shooting position. I never saw any movement. About 25 minutes after the shot I was finally standing next to him, half expecting to see a head shot bear. Upon completely skinning this bear out, I can say with confidence the bullet struck right where I'd aimed, mid-height in the ribs on a completely broadside shot. I cut into the heart lung cavity forward of the diaphram and could find no impact on the inside ribcage of the offside ribs. The bullet never made it to the far side ribs, yet the animal was dead on impact.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 340630, member: 4191"] Hydraulic shock or Hydrodynamic shock would probably be better descriptors. I read an article written by Jim Carmichel (used to be - maybe still is - Gun Editor with Outdoor Life). In his article, he presented the findings of bison or cows that were culled with high powered center fire rilfes on a ranch setting. These animals were center-shot through the rib cage with broadside hits, best as I remember. A person might be able to do a Google search and find the article. These animal's reaction to the bullet were observed and recorded. After the cull, veterinarians performed pathological examinations (autopsy) of the animals. Some percentage of the animals dropped at the shot - instant lights-out deaths. Others died over variable periods of time, same as big game animals do in response to similar bullet hits. The interesting part? All of the animals that expired instantly were observed to have suffered massive strokes. Vessels and arteries ruptured in their brains, and it was more or less concluded that the hydraulic pressure peaks that were transmitted through the blood vessels and arteries overpressured and ruptured arteries/vessels in the brain. Mr. Carmichel surmised that if the timing of the bullets impact coincided with the peak animal blood pressure that the added hydraulic pressure might be enough to kill by massive stroke. While another animal stuck very similarly, but when blood pressure was at a lower level might avoid massive stroke, and not produce an instant body-slam kill. I've hunted for a long time. Seen quite a number of large game harvested by bullet. I have no doubt that high velocity impacts (with bullets of weight reasonably proportionate to the size of the game animal) can cause immediate death. Death can be so instantaneous that I personally concluded that bullet impact caused shock must be disrupting or short circuiting the nervous system. Then I read the Carmichel article. I'm not completely sold on that explanation, but the Vets carefully autopsied all of these animals shot during this study, and massive brain strokes were observed on the ones that collapsed dead on their feet. The most dramatic instant death from a solid body hit I ever observed was a large boar brown bear I shot from a distance of 130 yds with a 338 Imperial Magnum. I used 225 grain Trophy Bonded Bear Claw bullets, one of the Jack Carter bullets before the company was sold to Speer. A 338 Imperial Magnum is virtually identical to the 338 Edge. This bear was standing broadside. I aimed center of the ribs just behind the front shoulder muscles. He collapsed so quickly I missed most of it due to rifle recoil. The way he dropped, and without so much as a twitch on the ground, I thought I might have brained him. This bear was standing on three feet of snow pack, and he was completely visible from my position. He squared 10' 5" and I could only estimate his weight at around 1000-1100 lbs. I couldn't believe a lung shot could put down a 1000 plus pound bear - instant lights out - like that. Because of these doubts, I waited and watched for a good 15 minutes before even getting up from my shooting position. I never saw any movement. About 25 minutes after the shot I was finally standing next to him, half expecting to see a head shot bear. Upon completely skinning this bear out, I can say with confidence the bullet struck right where I'd aimed, mid-height in the ribs on a completely broadside shot. I cut into the heart lung cavity forward of the diaphram and could find no impact on the inside ribcage of the offside ribs. The bullet never made it to the far side ribs, yet the animal was dead on impact. [/QUOTE]
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