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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Slow twist barrels and high velocity..
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<blockquote data-quote="Fiftydriver" data-source="post: 135977" data-attributes="member: 10"><p>I talked with Dan Lilja about the difference on velocity comparing a stadnard twist(1-10) to a fast twist(1-7) when I was starting my 7mm AM project. He said the difference from the rifling twist would be insignificant and that barrel to barrel variations would make more of a difference then the change in twist rate.</p><p></p><p>I tend to trust Dan when it comes to topics about internal ballistics, he has not steared me wrong yet.</p><p></p><p>One thing to keep in mind however is that if you want to use the thin jacketed bullets at very high velocity, the slower twist really become important because the reduce RPM levels to the point where the thin jacketed bullets can survive the high launch speeds. </p><p></p><p>For this reason they certainly do have their merit.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 135977, member: 10"] I talked with Dan Lilja about the difference on velocity comparing a stadnard twist(1-10) to a fast twist(1-7) when I was starting my 7mm AM project. He said the difference from the rifling twist would be insignificant and that barrel to barrel variations would make more of a difference then the change in twist rate. I tend to trust Dan when it comes to topics about internal ballistics, he has not steared me wrong yet. One thing to keep in mind however is that if you want to use the thin jacketed bullets at very high velocity, the slower twist really become important because the reduce RPM levels to the point where the thin jacketed bullets can survive the high launch speeds. For this reason they certainly do have their merit. Kirby Allen(50) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Slow twist barrels and high velocity..
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