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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
velocity in relation to barrle twist
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<blockquote data-quote="Mikecr" data-source="post: 31282" data-attributes="member: 1521"><p>This link brings you to a bullet design spreadsheet: <a href="http://www.angelfire.com/id/psycho/images/BDESIGN.xls" target="_blank">http://www.angelfire.com/id/psycho/images/BDESIGN.xls</a> </p><p>I don't know the source.</p><p>But It looks alot like Bob McCoy's work.</p><p></p><p>I preloaded a .224 80gr Berger into it and The results show a 7.5 twist as required for SG=1.5, with air density and velocity adjusted to correct all other resultant parameters.</p><p></p><p>Now if you change velocity only, even dramatically, you will notice that the twist rate required barely changes.</p><p>If you think its wrong, or you know of any stability program showing otherwise, Please steer me towards it.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 31282, member: 1521"] This link brings you to a bullet design spreadsheet: [url="http://www.angelfire.com/id/psycho/images/BDESIGN.xls"]http://www.angelfire.com/id/psycho/images/BDESIGN.xls[/url] I don't know the source. But It looks alot like Bob McCoy's work. I preloaded a .224 80gr Berger into it and The results show a 7.5 twist as required for SG=1.5, with air density and velocity adjusted to correct all other resultant parameters. Now if you change velocity only, even dramatically, you will notice that the twist rate required barely changes. If you think its wrong, or you know of any stability program showing otherwise, Please steer me towards it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
velocity in relation to barrle twist
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