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Long Range Hunting & Shooting
Effect of Bullet Spin on Terminal Performance
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<blockquote data-quote="crkckr" data-source="post: 1695450" data-attributes="member: 78056"><p>Ok, let's get this out the way first thing: a theory is a fact, subject to change with additional information. Someone's wild guess or even well thought out, but untested, <strong>idea</strong> is a hypothesis.</p><p></p><p>Anyone that believes that rotational speed has no effect on an *expanding* or fluted bullet is just flat out wrong. While the Black Talon gel tests have been mentioned, does no one remember the chunks of gel being thrown out of the entry hole? I certainly do! As an aside, there is no significent hydrostatic shock from a bullet traveling less than (depending on who you believe) 2000 to 2300 fps. There is not enough pressure to actually damage flesh beyond bruising. Once the speed threshold is reached, flesh & organs will be torn and damaged by the hydrostatic shock.</p><p></p><p>Watch the gel tests closely in virtually any of them and when the bullet expands there is always some additional damage done by the rotational speed of the bullet, which literally flings gel outwards from the center of the wound track (keep in mind gel and flesh do not act the same way). The fluted bullets, e.g. the Lehigh Defense XTreme bullets, depend on this rotation (and higher than normal velocity) to do the huge amount of damage they do to flesh. Shooting these 90 grain bullets out of my wife's Glock 26 (3.2" bbl) these +P+ rounds clock very close to 1400 fps! There is at least one vid on utube that shows a decent sized pig that was shot in the shoulder (after being shot in the neck and killed with a rifle) and the damage was nothing short of spectacular!</p><p></p><p>All that said, I suspect that rotational velocity is more critical to bullet stabilization than it is to wounding a critter. Even if the bullet were not spinning it would still expand and cause nearly the same damage and if the velocity is high enough, cause hydrostatic shock along the wound track. While it may help, the difference would probably not be significant. But that's just my guess, I am not in the least bit confident that it is so!</p><p>Cheers,</p><p>crkckr</p></blockquote><p></p>
[QUOTE="crkckr, post: 1695450, member: 78056"] Ok, let's get this out the way first thing: a theory is a fact, subject to change with additional information. Someone's wild guess or even well thought out, but untested, [B]idea[/B] is a hypothesis. Anyone that believes that rotational speed has no effect on an *expanding* or fluted bullet is just flat out wrong. While the Black Talon gel tests have been mentioned, does no one remember the chunks of gel being thrown out of the entry hole? I certainly do! As an aside, there is no significent hydrostatic shock from a bullet traveling less than (depending on who you believe) 2000 to 2300 fps. There is not enough pressure to actually damage flesh beyond bruising. Once the speed threshold is reached, flesh & organs will be torn and damaged by the hydrostatic shock. Watch the gel tests closely in virtually any of them and when the bullet expands there is always some additional damage done by the rotational speed of the bullet, which literally flings gel outwards from the center of the wound track (keep in mind gel and flesh do not act the same way). The fluted bullets, e.g. the Lehigh Defense XTreme bullets, depend on this rotation (and higher than normal velocity) to do the huge amount of damage they do to flesh. Shooting these 90 grain bullets out of my wife's Glock 26 (3.2" bbl) these +P+ rounds clock very close to 1400 fps! There is at least one vid on utube that shows a decent sized pig that was shot in the shoulder (after being shot in the neck and killed with a rifle) and the damage was nothing short of spectacular! All that said, I suspect that rotational velocity is more critical to bullet stabilization than it is to wounding a critter. Even if the bullet were not spinning it would still expand and cause nearly the same damage and if the velocity is high enough, cause hydrostatic shock along the wound track. While it may help, the difference would probably not be significant. But that's just my guess, I am not in the least bit confident that it is so! Cheers, crkckr [/QUOTE]
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