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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Lija 1:7 30cal
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<blockquote data-quote="RockyMtnMT" data-source="post: 1624438" data-attributes="member: 7999"><p>We have been dealing with this in [USER=30671]@HARPERC[/USER] 's 6.5 Ultracat. The long bullet that we designed for the 6" twist shot great until we reached 3300 fps. Lost stability. We first thought we were slipping in the rifling so we caught one to examine the bullet engraving. No slipping, nice clean engraving. The dynamic stability looks to be the culprit. The faster the bullet is going the more force is exerted on it causing it to tumble. The longer a bullet gets for caliber the more prevalent the problem gets.</p><p></p><p>Only downside to faster than needed twist that we have seen is that it causes more torque on the rifle, making it more difficult to shoot.</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 1624438, member: 7999"] We have been dealing with this in [USER=30671]@HARPERC[/USER] 's 6.5 Ultracat. The long bullet that we designed for the 6" twist shot great until we reached 3300 fps. Lost stability. We first thought we were slipping in the rifling so we caught one to examine the bullet engraving. No slipping, nice clean engraving. The dynamic stability looks to be the culprit. The faster the bullet is going the more force is exerted on it causing it to tumble. The longer a bullet gets for caliber the more prevalent the problem gets. Only downside to faster than needed twist that we have seen is that it causes more torque on the rifle, making it more difficult to shoot. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Lija 1:7 30cal
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