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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet stability calculation
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<blockquote data-quote="RockyMtnMT" data-source="post: 1132373" data-attributes="member: 7999"><p>So now I have been playing with these twist calculators and have noticed that temp changes have a large bearing on stability. A 12% change from 60* to 0* F. So that throws another wrench into the proverbial gear. I would never have thought that temp would have an effect on stability. So as Bryan Litz shows a lower stability factor degrades bc values. So a bullet that stabilizes at 1.4 at 60*F has very little drop in bc. Shoot that same bullet at 0*F and lose 7% of your bc. So what I am learning is that a guy needs to try and keep the stability factor above 1.5 if possible. Especially those of us up north that have such huge temp swings.</p><p> </p><p>Steve</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 1132373, member: 7999"] So now I have been playing with these twist calculators and have noticed that temp changes have a large bearing on stability. A 12% change from 60* to 0* F. So that throws another wrench into the proverbial gear. I would never have thought that temp would have an effect on stability. So as Bryan Litz shows a lower stability factor degrades bc values. So a bullet that stabilizes at 1.4 at 60*F has very little drop in bc. Shoot that same bullet at 0*F and lose 7% of your bc. So what I am learning is that a guy needs to try and keep the stability factor above 1.5 if possible. Especially those of us up north that have such huge temp swings. Steve [/QUOTE]
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Bullet stability calculation
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