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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet stabilization, strictly RPM?
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<blockquote data-quote="devildoc" data-source="post: 170872" data-attributes="member: 5615"><p>Okay, I didn't really have time to explain well before so I will now. So if you have a bullet with a muzzle velocity of say 3000fps and a 1:12 twist. that means that the bullet will spin 3000 revolutions per second or 180,000rpm (180krpm). That spin will only slow slightly during flight, not enough to worry about for our purposes. So if at some distance the projectile is only going 2000fps and the bullet still only takes 1/3000 of a second to turn, the projectile will only be going 2/3rds of a foot or 8" per turn compared to the muzzle value of 12" per turn. This corresponds to less displacement per turn. Got it now?</p><p></p><p>On an interesting side note, alot of people are always talking about how a spinning bullet will do some kind of terminal blender action when it hits, looking at the numbers above kinda illustrates how that just isn't the case. You hit a large hunk of big game animal and the bullets only going to spin a few times at most spread out over a couple feet of tissue, probably much less considering that once expansion initiates that spin will slow rapidly.</p></blockquote><p></p>
[QUOTE="devildoc, post: 170872, member: 5615"] Okay, I didn't really have time to explain well before so I will now. So if you have a bullet with a muzzle velocity of say 3000fps and a 1:12 twist. that means that the bullet will spin 3000 revolutions per second or 180,000rpm (180krpm). That spin will only slow slightly during flight, not enough to worry about for our purposes. So if at some distance the projectile is only going 2000fps and the bullet still only takes 1/3000 of a second to turn, the projectile will only be going 2/3rds of a foot or 8" per turn compared to the muzzle value of 12" per turn. This corresponds to less displacement per turn. Got it now? On an interesting side note, alot of people are always talking about how a spinning bullet will do some kind of terminal blender action when it hits, looking at the numbers above kinda illustrates how that just isn't the case. You hit a large hunk of big game animal and the bullets only going to spin a few times at most spread out over a couple feet of tissue, probably much less considering that once expansion initiates that spin will slow rapidly. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet stabilization, strictly RPM?
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