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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger Bullet stability?
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<blockquote data-quote="BryanLitz" data-source="post: 329328" data-attributes="member: 7848"><p>edge,</p><p></p><p>Sorry for not replying to your question sooner.</p><p></p><p>The Miller stability formula is based on 'nominal' projectiles that have 'nominal' shape and balance. If a bullet is too far away from ordinary in some way, it can cause the program to have some error.</p><p></p><p>The thing that's special about the 155 VLD is the large void in the nose. This will affect the balance/mass distribution in a way that is favorable for stability. In particular, the ratio of transverse to axial moments of inertia is lowered by the short core. </p><p></p><p>Rest assured that even though the Miller stability formula predicts instability for this bullet in cold climates, the bullet will be jut fine in the 1:14" twist. </p><p></p><p>When calculating the recommended twist rates Berger uses a different program that's more sophisticated (much less user friendly) to more accurately calculate the bullets stability requirements taking into account all the details of the bullets construction. The error in the Miller formula (when there is error) tends to be conservative which is good. It would indicate a faster twist than you necessarily need, so it will keep you out of trouble.</p><p></p><p>Hope this answers your question,</p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 329328, member: 7848"] edge, Sorry for not replying to your question sooner. The Miller stability formula is based on 'nominal' projectiles that have 'nominal' shape and balance. If a bullet is too far away from ordinary in some way, it can cause the program to have some error. The thing that's special about the 155 VLD is the large void in the nose. This will affect the balance/mass distribution in a way that is favorable for stability. In particular, the ratio of transverse to axial moments of inertia is lowered by the short core. Rest assured that even though the Miller stability formula predicts instability for this bullet in cold climates, the bullet will be jut fine in the 1:14" twist. When calculating the recommended twist rates Berger uses a different program that's more sophisticated (much less user friendly) to more accurately calculate the bullets stability requirements taking into account all the details of the bullets construction. The error in the Miller formula (when there is error) tends to be conservative which is good. It would indicate a faster twist than you necessarily need, so it will keep you out of trouble. Hope this answers your question, -Bryan [/QUOTE]
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Berger Bullet stability?
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