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Hunting
Long Range Hunting & Shooting
Optimum barrel length and twist for 223?
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<blockquote data-quote="Tare" data-source="post: 1196774" data-attributes="member: 95336"><p>Lighter bullets come apart in .223s with tight twists and higher MV. Greater dispersion from bullet imbalance, being spun faster than needed for stability may also be an issue .</p><p></p><p>5000fps in a 12 twist = 300k rpm</p><p>4000fps in a 12 twist = 240k rpm</p><p>3000fps in a 8 twist =270k rpm</p><p></p><p>With my 18" 7 twist .223 my 45gr tsx load is 3175fps that is about 326k rpm. So a .223 has plenty of power to over spin a varmint bullet.</p></blockquote><p></p>
[QUOTE="Tare, post: 1196774, member: 95336"] Lighter bullets come apart in .223s with tight twists and higher MV. Greater dispersion from bullet imbalance, being spun faster than needed for stability may also be an issue . 5000fps in a 12 twist = 300k rpm 4000fps in a 12 twist = 240k rpm 3000fps in a 8 twist =270k rpm With my 18" 7 twist .223 my 45gr tsx load is 3175fps that is about 326k rpm. So a .223 has plenty of power to over spin a varmint bullet. [/QUOTE]
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Optimum barrel length and twist for 223?
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