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Hunting
The Basics, Starting Out
"Knock down" power
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<blockquote data-quote="Warren Jensen" data-source="post: 51601" data-attributes="member: 21"><p>Dave is right. "Knockdown" is an overused and misused term when it comes to lethality. In actual fact there is less energy, momentum and power at the killing end, due to velocity loss, than on your shoulder when the rifle is fired. Did it knock you down?</p><p></p><p>When these observations are made what is generally observed is the permanent or temporary shutting down of the central nervous system of the animal causing the animal to "just drop". It has been described as turning off a switch. If the animal is moving at all when this happens it can appear that it was knocked over.</p><p></p><p>This shutting down of the central nervous system is a complicated phenomena and is not always permanent. The classic case is the buck which is hit in the antler, knocked unconscious, until the hunter gets closer or even beginning to dress the animal, at which point it gets up and everyone is startled. Hits in the brain or spine can cause this. Hits near the spine with fast energy dumping bullets can cause this. Hits further away from the spine with bullets that have the right combination of expansion and penetration velocity can cause this. The further away from the brain that the hit occurs that "turns of the switch" the less the likelyhood that the animal will regain consciousness. Shoulder and body hits like this are very nearly always fatal. After much study of this phenomena it is my opinion that the right combination of expansion, velocity, wave effect, and penetration velocity combined with tissue structure and distance to the spine will cause an electrical, or electrical-like, impulse through the tissue and nerves that shuts down the central nervous system. On body hits this occurs most often on deer and elk in the higher shoulder region with the bullet passing directly through both shoulders. </p><p></p><p>I have witnessed this phenomena a number of times and the suddenness with which the animal collapses does indeed present the image that it was "knocked down".</p></blockquote><p></p>
[QUOTE="Warren Jensen, post: 51601, member: 21"] Dave is right. "Knockdown" is an overused and misused term when it comes to lethality. In actual fact there is less energy, momentum and power at the killing end, due to velocity loss, than on your shoulder when the rifle is fired. Did it knock you down? When these observations are made what is generally observed is the permanent or temporary shutting down of the central nervous system of the animal causing the animal to "just drop". It has been described as turning off a switch. If the animal is moving at all when this happens it can appear that it was knocked over. This shutting down of the central nervous system is a complicated phenomena and is not always permanent. The classic case is the buck which is hit in the antler, knocked unconscious, until the hunter gets closer or even beginning to dress the animal, at which point it gets up and everyone is startled. Hits in the brain or spine can cause this. Hits near the spine with fast energy dumping bullets can cause this. Hits further away from the spine with bullets that have the right combination of expansion and penetration velocity can cause this. The further away from the brain that the hit occurs that "turns of the switch" the less the likelyhood that the animal will regain consciousness. Shoulder and body hits like this are very nearly always fatal. After much study of this phenomena it is my opinion that the right combination of expansion, velocity, wave effect, and penetration velocity combined with tissue structure and distance to the spine will cause an electrical, or electrical-like, impulse through the tissue and nerves that shuts down the central nervous system. On body hits this occurs most often on deer and elk in the higher shoulder region with the bullet passing directly through both shoulders. I have witnessed this phenomena a number of times and the suddenness with which the animal collapses does indeed present the image that it was "knocked down". [/QUOTE]
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The Basics, Starting Out
"Knock down" power
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