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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Best 6.5 Creedmoor twist rate?
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<blockquote data-quote="Greyfox" data-source="post: 1474222" data-attributes="member: 10291"><p>I'm neither a Ballistician or bullet maker but this is my understanding/viewpoint on the subject of twist rate. Everyone seems to jumping on the "fast twist" bandwagon these days choosing the fastest twist available without regard for the optimimum load that will be used in the rifle. Yes, a fast enough twist must be used to stabilize your chosen bullet and velocity, but the rationale that more is better in all cases may have consequences.. While it may be true that you can't over stabilize a bullet, there are other factors to consider. Accuracy, barrel life, and ES, and velocity. The simple physics is that the bullet has to be grabbed by the rifling at the throat. The faster the twist, the more time and distance is necessary for the bullet to "grab' the rifling, a difficult task if accelerating from 0 to 3000FPS in nanoseconds. Sliding and torsional forces prior to grip can effect its stable entry into the rifling and cause accuracy degradation and premature wear where the rifling meets the throat. Also, a faster twist generally results in lower velocity for a given set of conditions. This is the reason Benchresters choose the slowest twist possible that stabilizes with their chosen load. This IS the reason the premium barrel makers supply their barrels in a wide variety of twist rates. It's also true that many shooters(and possibly some rifle makers) may never realize a difference due to lower(or the absence of) performance standards. .</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1474222, member: 10291"] I’m neither a Ballistician or bullet maker but this is my understanding/viewpoint on the subject of twist rate. Everyone seems to jumping on the “fast twist” bandwagon these days choosing the fastest twist available without regard for the optimimum load that will be used in the rifle. Yes, a fast enough twist must be used to stabilize your chosen bullet and velocity, but the rationale that more is better in all cases may have consequences.. While it may be true that you can’t over stabilize a bullet, there are other factors to consider. Accuracy, barrel life, and ES, and velocity. The simple physics is that the bullet has to be grabbed by the rifling at the throat. The faster the twist, the more time and distance is necessary for the bullet to “grab’ the rifling, a difficult task if accelerating from 0 to 3000FPS in nanoseconds. Sliding and torsional forces prior to grip can effect its stable entry into the rifling and cause accuracy degradation and premature wear where the rifling meets the throat. Also, a faster twist generally results in lower velocity for a given set of conditions. This is the reason Benchresters choose the slowest twist possible that stabilizes with their chosen load. This IS the reason the premium barrel makers supply their barrels in a wide variety of twist rates. It’s also true that many shooters(and possibly some rifle makers) may never realize a difference due to lower(or the absence of) performance standards. . [/QUOTE]
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Best 6.5 Creedmoor twist rate?
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