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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
ballistic coefficient on bullets
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<blockquote data-quote="Michael Eichele" data-source="post: 131332" data-attributes="member: 1007"><p>While Sierra doesnt have any mathematical formulas that I am aware of, they do preach this principal.</p><p></p><p>I do know this, if it takes a 14 twist to stabilize a 155 30 cal AMAX and you run it through a 1-10x, the BC will always be lower in the 10x vs the 14x unless you drastically reduce its velocity to a level that isnt practical. The differance at 2900 FPS could be an average of about up to .060 of a BC. This is based on real world experiance. Does that make it fact? It is a fact that it happened to me. Do I have any mathematical formulas to calculate and predict what differing bullets and twists will be or know of any? No. </p><p></p><p>Also, overspining causes slightly more spin drift. Not near as much a BC decay though.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 131332, member: 1007"] While Sierra doesnt have any mathematical formulas that I am aware of, they do preach this principal. I do know this, if it takes a 14 twist to stabilize a 155 30 cal AMAX and you run it through a 1-10x, the BC will always be lower in the 10x vs the 14x unless you drastically reduce its velocity to a level that isnt practical. The differance at 2900 FPS could be an average of about up to .060 of a BC. This is based on real world experiance. Does that make it fact? It is a fact that it happened to me. Do I have any mathematical formulas to calculate and predict what differing bullets and twists will be or know of any? No. Also, overspining causes slightly more spin drift. Not near as much a BC decay though. [/QUOTE]
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ballistic coefficient on bullets
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