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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Berger 180 Hybrid twist rate help
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<blockquote data-quote="groper" data-source="post: 469315" data-attributes="member: 12550"><p>Thats when you can use this tool to make sure your ok for next winter --> <a href="http://accurateshooter.net/Blog/millerformula.xls" target="_blank">http://accurateshooter.net/Blog/millerformula.xls</a></p><p></p><p>Remember required twist rates vary according to the conditions, and contrary to popular belief, increasing velocity only increases stability SLIGHTLY. By far the biggest factors are AIR DENSITY, and bullet length (which is always the same if your using same the same bullet of course).</p><p></p><p>The above spreadsheet will help you find an ideal twist rate if you dont mind restricting yourself to a temperature and altitude range, you can get away with significantly slower twist rates than what manufacturers recommend.</p></blockquote><p></p>
[QUOTE="groper, post: 469315, member: 12550"] Thats when you can use this tool to make sure your ok for next winter --> [URL]http://accurateshooter.net/Blog/millerformula.xls[/URL] Remember required twist rates vary according to the conditions, and contrary to popular belief, increasing velocity only increases stability SLIGHTLY. By far the biggest factors are AIR DENSITY, and bullet length (which is always the same if your using same the same bullet of course). The above spreadsheet will help you find an ideal twist rate if you dont mind restricting yourself to a temperature and altitude range, you can get away with significantly slower twist rates than what manufacturers recommend. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Berger 180 Hybrid twist rate help
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