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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
ballistic coefficient on bullets
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<blockquote data-quote="goodgrouper" data-source="post: 130971" data-attributes="member: 2852"><p>If anyone ever rebuked you for stating that a bullet can be overstabilized, they obviously have never done much experimenting or reading. Just ask the legions of "black gunners" how much fun they had trying to get 40 grain vmax's to shoot accurately in their AR's. Even those guys find out eventually that they're just flogging a dead horse because a 1-8 or 1-9" twist just ain't gonna be kind to a 40 grain bullet. It is only because it is being spun a few more thousand times per minute that what it was designed to do, that's all!</p><p></p><p>This is a well documented principle of exterior ballistics. Dan's article is not the only good read. Sierra's most recent manual also has some good detailed info on the fact as well as Vihtavhouri's manual. Robert Rinker's "Understanding Firearm Ballistics" also has a great explanation.</p><p></p><p>It is better to have too fast a twist than too slow, but ideally, every bullet has a design spec window for rpm's and they shoot better when in that window. </p><p></p><p>Br guys are now ordering barrels with 13.5" twist because they shoot just a hair better than 14's. So they are custom tailoring a twist to their bullet so that it is not too fast or too slow. </p><p></p><p>Just throw that at the next guy who wants to tell you there is no such thing as overstabilization. /ubbthreads/images/graemlins/wink.gif</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 130971, member: 2852"] If anyone ever rebuked you for stating that a bullet can be overstabilized, they obviously have never done much experimenting or reading. Just ask the legions of "black gunners" how much fun they had trying to get 40 grain vmax's to shoot accurately in their AR's. Even those guys find out eventually that they're just flogging a dead horse because a 1-8 or 1-9" twist just ain't gonna be kind to a 40 grain bullet. It is only because it is being spun a few more thousand times per minute that what it was designed to do, that's all! This is a well documented principle of exterior ballistics. Dan's article is not the only good read. Sierra's most recent manual also has some good detailed info on the fact as well as Vihtavhouri's manual. Robert Rinker's "Understanding Firearm Ballistics" also has a great explanation. It is better to have too fast a twist than too slow, but ideally, every bullet has a design spec window for rpm's and they shoot better when in that window. Br guys are now ordering barrels with 13.5" twist because they shoot just a hair better than 14's. So they are custom tailoring a twist to their bullet so that it is not too fast or too slow. Just throw that at the next guy who wants to tell you there is no such thing as overstabilization. [img]/ubbthreads/images/graemlins/wink.gif[/img] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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ballistic coefficient on bullets
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