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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Long bullets require fast twist barrels?
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<blockquote data-quote="MontanaRifleman" data-source="post: 864661" data-attributes="member: 11717"><p>Michael, I am not an "expert" on stabilization but I do have a certain amount of basic knowledge and one thing I do know is that the rules are different for copper vs lead core. That's a fact. Monometal bullets of same weight require faster twists than lead core bullets. Even mono's of same length and lighter require faster twists. The twist calc itself bears this out to a degree. </p><p></p><p>You can also see this in what the bullet makers produce. For instance, Nosler will not make a 308 E-Tip any larger than the 180 gr, reason being, it's a lighter mono and anything heavier and longer than the 180 will not stabilize in an 11" twist. They do make a 200 gr AB which is almost exactly the same shape and will stabilize in the same 11" twist that the 180 E-tips stabilizes in.</p><p></p><p>In the end, it's not that big of deal. Either your bullet stabilizes or it doesn't. If in doubt, get a faster twist. I have a very good idea of how well certain bullets will stabilize and the Berger calc is a good tool to use. When it comes to mono's, I would subtract bout .2.3 off the calculated Sg. and that will get you close.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 864661, member: 11717"] Michael, I am not an "expert" on stabilization but I do have a certain amount of basic knowledge and one thing I do know is that the rules are different for copper vs lead core. That's a fact. Monometal bullets of same weight require faster twists than lead core bullets. Even mono's of same length and lighter require faster twists. The twist calc itself bears this out to a degree. You can also see this in what the bullet makers produce. For instance, Nosler will not make a 308 E-Tip any larger than the 180 gr, reason being, it's a lighter mono and anything heavier and longer than the 180 will not stabilize in an 11" twist. They do make a 200 gr AB which is almost exactly the same shape and will stabilize in the same 11" twist that the 180 E-tips stabilizes in. In the end, it's not that big of deal. Either your bullet stabilizes or it doesn't. If in doubt, get a faster twist. I have a very good idea of how well certain bullets will stabilize and the Berger calc is a good tool to use. When it comes to mono's, I would subtract bout .2.3 off the calculated Sg. and that will get you close. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Long bullets require fast twist barrels?
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