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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.220 Swift - Non Lead - 1:14 twist
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<blockquote data-quote="scope-eye" data-source="post: 2158335" data-attributes="member: 21274"><p>That is not quite correct, the reason they have recomended twist rates for certain bullets is because that bullet in particular needs a certain RPM to stabilize. OK here we go a bullet traveling 3000fps with a 12 twist will exit the barrel at 180,000 rpm. A bullet traveling 3500fps with a 14 twist will also exit the barrel at 180,000 rpm. In my case I have a 220 swift AI with a 16 twist and I can send that same bullet 4000fps and they will also exit at 180,000 rpm.</p><p>The formula is Muzzle Velocity X 720 Divided by Twist Rate. Hope this helps</p><p></p><p>Dean</p><p></p><p>PS: That 220 Swift AI has just shy of 50gr of powder capacity and can send those 50gr Barnes 4500fps.</p></blockquote><p></p>
[QUOTE="scope-eye, post: 2158335, member: 21274"] That is not quite correct, the reason they have recomended twist rates for certain bullets is because that bullet in particular needs a certain RPM to stabilize. OK here we go a bullet traveling 3000fps with a 12 twist will exit the barrel at 180,000 rpm. A bullet traveling 3500fps with a 14 twist will also exit the barrel at 180,000 rpm. In my case I have a 220 swift AI with a 16 twist and I can send that same bullet 4000fps and they will also exit at 180,000 rpm. The formula is Muzzle Velocity X 720 Divided by Twist Rate. Hope this helps Dean PS: That 220 Swift AI has just shy of 50gr of powder capacity and can send those 50gr Barnes 4500fps. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.220 Swift - Non Lead - 1:14 twist
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