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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: 131652" data-attributes="member: 2852"><p>[ QUOTE ]</p><p>Afterall, there are penalties(in accuracy) for excess twist due to imperfections in bullets. </p><p></p><p> </p><p></p><p>[/ QUOTE ] </p><p></p><p>I agree with that. But there must be something else to it because custom short range br bullets are almost devoid of imperfections (as close as any projectile can currently be) and yet they still shoot them in 14" twist instead of 9" twists. And, I have fired many super short bullets(55 grain class) through my competitive accuracy 6br 14" twist and have not gotten as good of accuracy as running the 60-70 grain bullets. I would be willing to wager that if my barrel had a 16" twist, they would shoot much better. </p><p></p><p>And another thing, those little 55 grain bullets can go 3900 fps out of a 6br with a 14" twist, and they do not blow up in route and in fact are far from blowing up and they still don't shoot well. So, they hold together and yet they can't seem to settle down. Why?</p><p></p><p>I can say that this is a fact:</p><p>All bullets exhibit yaw and/or nutation as soon as they leave any barrel regardless of twist rate. It is only a matter of time before they all go "to sleep" in the proper twist /ubbthreads/images/graemlins/shocked.gif. Short bullets usually go to sleep quicker than long bullets, but both their bc's are not as high before this point as they will be after this point-UNLESS the nose of the bullet stays pointed away from the arc of trajectory which is exactly what happens downrange when bullets are shot from too fast of twists. In this case, the bc can go down, then up, then down again downrange. High speed cameras can see this as well as doppler radar can detect it.</p><p></p><p>Have you run your search on Google for the math yet?</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 131652, member: 2852"] [ QUOTE ] Afterall, there are penalties(in accuracy) for excess twist due to imperfections in bullets. [/ QUOTE ] I agree with that. But there must be something else to it because custom short range br bullets are almost devoid of imperfections (as close as any projectile can currently be) and yet they still shoot them in 14" twist instead of 9" twists. And, I have fired many super short bullets(55 grain class) through my competitive accuracy 6br 14" twist and have not gotten as good of accuracy as running the 60-70 grain bullets. I would be willing to wager that if my barrel had a 16" twist, they would shoot much better. And another thing, those little 55 grain bullets can go 3900 fps out of a 6br with a 14" twist, and they do not blow up in route and in fact are far from blowing up and they still don't shoot well. So, they hold together and yet they can't seem to settle down. Why? I can say that this is a fact: All bullets exhibit yaw and/or nutation as soon as they leave any barrel regardless of twist rate. It is only a matter of time before they all go "to sleep" in the proper twist [img]/ubbthreads/images/graemlins/shocked.gif[/img]. Short bullets usually go to sleep quicker than long bullets, but both their bc's are not as high before this point as they will be after this point-UNLESS the nose of the bullet stays pointed away from the arc of trajectory which is exactly what happens downrange when bullets are shot from too fast of twists. In this case, the bc can go down, then up, then down again downrange. High speed cameras can see this as well as doppler radar can detect it. Have you run your search on Google for the math yet? [/QUOTE]
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ballistic coefficient on bullets
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