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Joined: Oct 2007
Posts: 14,262
Campfire Outfitter
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Campfire Outfitter
Joined: Oct 2007
Posts: 14,262 |
Dempsey:
<br>
<br>There are some other interesting facts and consequences of spinning bullets.
<br>
<br>* The twist rate in most rifles is actually not suited for the full range of grain weights available. True
<br>
<br>* The twist rate is only one element of determining the numbers of revolutions . True<br>
<br>* The velocity also governs the rpm's. True
<br>
<br>* The twist rates for bigger bullets are slower than those of smaller bullets. FALSE! Heavier bullets require FASTER twists to properly stabalize them i.e in 223 you need a 1/7 or 1/8 to stabilize the heavier 80gr bullets, a slower 1/12 won't work with them.<br>
<br>* Small bullets spun too fast will shed their cladding and disintegratre due to excessive centrifugal force. True - I've seen them do it.<br>
<br>* Bullet spin rate has been related to penetration depth in animals! FALSE! The rotational inertia of a bullet is a very small fraction of the total energy of a bullet and is unrelated to penetration depth.
<br>
<br>Bill Tibbe Depends on what the meaning of bigger bullets is.If being bigger means larger dia.Then the answer of a slower twist is correct.
Its all right to be white!!
Stupidity left unattended will run rampant
Don't argue with stupid people, They will drag you down to their level and then win by experience
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Joined: Mar 2004
Posts: 6,749
Campfire Tracker
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Campfire Tracker
Joined: Mar 2004
Posts: 6,749 |
Dempsey:
<br>
<br>There are some other interesting facts and consequences of spinning bullets.
<br>
<br>* The twist rate in most rifles is actually not suited for the full range of grain weights available. True
<br>
<br>* The twist rate is only one element of determining the numbers of revolutions . True<br>
<br>* The velocity also governs the rpm's. True
<br>
<br>* The twist rates for bigger bullets are slower than those of smaller bullets. FALSE! Heavier bullets require FASTER twists to properly stabalize them i.e in 223 you need a 1/7 or 1/8 to stabilize the heavier 80gr bullets, a slower 1/12 won't work with them.<br>
<br>* Small bullets spun too fast will shed their cladding and disintegratre due to excessive centrifugal force. True - I've seen them do it.<br>
<br>* Bullet spin rate has been related to penetration depth in animals! FALSE! The rotational inertia of a bullet is a very small fraction of the total energy of a bullet and is unrelated to penetration depth.
<br>
<br>Bill Tibbe Depends on what the meaning of bigger bullets is.If being bigger means larger dia.Then the answer of a slower twist is correct. No, it depends on the weight of a bullet and the velocity it's driven at. You need a faster twist barrel to shoot 300gr 338cal bullets out of a 338 Lapua for another example. In the heavier calibers recoil limits the velocity you are going to drive the heavier bullets but the twist rate is still a function of how fast you drive what weight of bullet and sometimes form factors not by it's diameter........................DJ
Remember this is all supposed to be for fun.......................
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Joined: Oct 2002
Posts: 96,121
Campfire Oracle
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Campfire Oracle
Joined: Oct 2002
Posts: 96,121 |
Dempsey:
<br>
<br>There are some other interesting facts and consequences of spinning bullets.
<br>
<br>* The twist rate in most rifles is actually not suited for the full range of grain weights available. True
<br>
<br>* The twist rate is only one element of determining the numbers of revolutions . True<br>
<br>* The velocity also governs the rpm's. True
<br>
<br>* The twist rates for bigger bullets are slower than those of smaller bullets. FALSE! Heavier bullets require FASTER twists to properly stabalize them i.e in 223 you need a 1/7 or 1/8 to stabilize the heavier 80gr bullets, a slower 1/12 won't work with them.<br>
<br>* Small bullets spun too fast will shed their cladding and disintegratre due to excessive centrifugal force. True - I've seen them do it.<br>
<br>* Bullet spin rate has been related to penetration depth in animals! FALSE! The rotational inertia of a bullet is a very small fraction of the total energy of a bullet and is unrelated to penetration depth.
<br>
<br>Bill Tibbe Depends on what the meaning of bigger bullets is.If being bigger means larger dia.Then the answer of a slower twist is correct. No, it depends on the weight of a bullet and the velocity it's driven at. You need a faster twist barrel to shoot 300gr 338cal bullets out of a 338 Lapua for another example. In the heavier calibers recoil limits the velocity you are going to drive the heavier bullets but the twist rate is still a function of how fast you drive what weight of bullet and sometimes form factors not by it's diameter........................DJ Sorry, multiple quotes are cool!
"Dear Lord, save me from Your followers"
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Joined: Dec 2000
Posts: 29,348
Campfire Ranger
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Campfire Ranger
Joined: Dec 2000
Posts: 29,348 |
Increasingly, Campfire threads are showing that opinions can be spun too fast! This is no place for Bill O'Reilly! 
"Good enough" isn't.
Always take your responsibilities seriously but never yourself.
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Joined: Oct 2007
Posts: 14,262
Campfire Outfitter
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Campfire Outfitter
Joined: Oct 2007
Posts: 14,262 |
Increasingly, Campfire threads are showing that opinions can be spun too fast! This is no place for Bill O'Reilly! Sir ,we are in complete agreement!!!!!
Its all right to be white!!
Stupidity left unattended will run rampant
Don't argue with stupid people, They will drag you down to their level and then win by experience
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Joined: Oct 2007
Posts: 14,262
Campfire Outfitter
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Campfire Outfitter
Joined: Oct 2007
Posts: 14,262 |
Dempsey:
<br>
<br>There are some other interesting facts and consequences of spinning bullets.
<br>
<br>* The twist rate in most rifles is actually not suited for the full range of grain weights available. True
<br>
<br>* The twist rate is only one element of determining the numbers of revolutions . True<br>
<br>* The velocity also governs the rpm's. True
<br>
<br>* The twist rates for bigger bullets are slower than those of smaller bullets. FALSE! Heavier bullets require FASTER twists to properly stabalize them i.e in 223 you need a 1/7 or 1/8 to stabilize the heavier 80gr bullets, a slower 1/12 won't work with them.<br>
<br>* Small bullets spun too fast will shed their cladding and disintegratre due to excessive centrifugal force. True - I've seen them do it.<br>
<br>* Bullet spin rate has been related to penetration depth in animals! FALSE! The rotational inertia of a bullet is a very small fraction of the total energy of a bullet and is unrelated to penetration depth.
<br>
<br>Bill Tibbe Depends on what the meaning of bigger bullets is.If being bigger means larger dia.Then the answer of a slower twist is correct. No, it depends on the weight of a bullet and the velocity it's driven at. You need a faster twist barrel to shoot 300gr 338cal bullets out of a 338 Lapua for another example. In the heavier calibers recoil limits the velocity you are going to drive the heavier bullets but the twist rate is still a function of how fast you drive what weight of bullet and sometimes form factors not by it's diameter........................DJ Well a 1 in 12 twist in a 35 caliber might be fast for that caliber,but it is slower than a 1 in 8 in a 6.5 .
Its all right to be white!!
Stupidity left unattended will run rampant
Don't argue with stupid people, They will drag you down to their level and then win by experience
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