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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger - Twist Rate Recommendation Update
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<blockquote data-quote="Rockfish Dave" data-source="post: 1155723" data-attributes="member: 14257"><p>Still kind of strange. Your twist rate and velocity should be fine.</p><p></p><p>I'm running a 1:9.75 gain twist that stabilizes any of the current 350 grain offerings at a slower muzzle velocity. That includes some stupid long brass solids.</p><p></p><p>Your 1.8 stability factor (SF) is pretty solid. Something doesn't sound right for it to key hole like you describe.</p><p></p><p>* As an aside: I created a stability calculator spreadsheet so I could verify all projectiles of interest for appropriate twist rates to get an acceptable stability factor. My calculations sync up with the Berger calculator quite well, but allow me to calculate multiple projectiles at once. I also added columns to indicate SF at trans-sonic velocities as well...</p></blockquote><p></p>
[QUOTE="Rockfish Dave, post: 1155723, member: 14257"] Still kind of strange. Your twist rate and velocity should be fine. I'm running a 1:9.75 gain twist that stabilizes any of the current 350 grain offerings at a slower muzzle velocity. That includes some stupid long brass solids. Your 1.8 stability factor (SF) is pretty solid. Something doesn't sound right for it to key hole like you describe. * As an aside: I created a stability calculator spreadsheet so I could verify all projectiles of interest for appropriate twist rates to get an acceptable stability factor. My calculations sync up with the Berger calculator quite well, but allow me to calculate multiple projectiles at once. I also added columns to indicate SF at trans-sonic velocities as well... [/QUOTE]
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Berger - Twist Rate Recommendation Update
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