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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
“Over twisting” a problem?
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<blockquote data-quote="Franko21" data-source="post: 2091937" data-attributes="member: 108629"><p>The overspin formula that I have seen used is below. Supposedly above 300K RPM and you become more likely to blow up bullets. This will also be influenced by the state of the barrel (e.g., an older rougher barrel will blow them up at lower RPM).</p><p></p><p>(MV*720)/BTR = RPM</p><p></p><p>MV = muzzle velocity</p><p></p><p>BTR = barrel twist rate</p></blockquote><p></p>
[QUOTE="Franko21, post: 2091937, member: 108629"] The overspin formula that I have seen used is below. Supposedly above 300K RPM and you become more likely to blow up bullets. This will also be influenced by the state of the barrel (e.g., an older rougher barrel will blow them up at lower RPM). (MV*720)/BTR = RPM MV = muzzle velocity BTR = barrel twist rate [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
“Over twisting” a problem?
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