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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="RockyMtnMT" data-source="post: 1474239" data-attributes="member: 7999"><p>I think Greyfox is correct. From my perspective as a lead free pure copper bullet maker faster twist rates are needed to shoot the heavier bullets. The copper bullet is longer for the same weight as a lead core bullet, thus requiring more twist to stabilize. As a general rule the pure copper bullets are not as fragile as the jacketed bullets so there is less chance of the force of starting the bullet into the twist, in that moment of initial acceleration, causing damage to the bullet. Seems today's cup and core bullets have improved to take the higher vel and faster twist rates that are available now that were not too common even 10 years ago. If you decide to shoot lighter for caliber bullets you should not have trouble unless they are not well built. You could find yourself slightly limited in your options for light bullets but have much more options for heavier ones.</p><p></p><p>Higher rpm's or stability factor does aid in a bullets ability to stay point on and track straight after impact, thus aiding in terminal performance. For me as a hunter this has become very important to me. After all the testing that we have done, the first thing I consider when choosing a bullet is the sg for good terminal performance.</p><p></p><p>All in all I think there is more upside to the faster twist rate than down side.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 1474239, member: 7999"] I think Greyfox is correct. From my perspective as a lead free pure copper bullet maker faster twist rates are needed to shoot the heavier bullets. The copper bullet is longer for the same weight as a lead core bullet, thus requiring more twist to stabilize. As a general rule the pure copper bullets are not as fragile as the jacketed bullets so there is less chance of the force of starting the bullet into the twist, in that moment of initial acceleration, causing damage to the bullet. Seems today's cup and core bullets have improved to take the higher vel and faster twist rates that are available now that were not too common even 10 years ago. If you decide to shoot lighter for caliber bullets you should not have trouble unless they are not well built. You could find yourself slightly limited in your options for light bullets but have much more options for heavier ones. Higher rpm's or stability factor does aid in a bullets ability to stay point on and track straight after impact, thus aiding in terminal performance. For me as a hunter this has become very important to me. After all the testing that we have done, the first thing I consider when choosing a bullet is the sg for good terminal performance. All in all I think there is more upside to the faster twist rate than down side. Steve [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Best 6.5 Creedmoor twist rate?
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