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Rifles, Reloading, Optics, Equipment
Reloading
Bullet stability
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<blockquote data-quote="Mikecr" data-source="post: 2824189" data-attributes="member: 1521"><p>No, not really.</p><p>Shooting through air is similar to shooting underwater. The velocity itself just doesn't make any difference to the bullet wanting to waiver or tumble.</p><p></p><p>BC and stability are not directly tied, and only loosely similar.</p><p>If you had a matching drag curve for your bullet, BC would not change while traveling downrange.</p><p>If actually talking about bullet drag changing downrange, this is not easy to calculate. While a drag coefficient typically goes up with slowing velocity, drag itself (which is squared with speed) is going down.</p><p></p><p>It happens that Sg goes up downrange, because revolutions decrease at a lower rate than velocity. The 'effective' twist rate goes up.</p><p>Once the bullet is above 1.5Sg (fully stable) then little variances to stability from changing bullet drag doesn't matter.</p><p>It's when drag hits hard that strong stability is challenged. Like at transonic and animal impact.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2824189, member: 1521"] No, not really. Shooting through air is similar to shooting underwater. The velocity itself just doesn't make any difference to the bullet wanting to waiver or tumble. BC and stability are not directly tied, and only loosely similar. If you had a matching drag curve for your bullet, BC would not change while traveling downrange. If actually talking about bullet drag changing downrange, this is not easy to calculate. While a drag coefficient typically goes up with slowing velocity, drag itself (which is squared with speed) is going down. It happens that Sg goes up downrange, because revolutions decrease at a lower rate than velocity. The 'effective' twist rate goes up. Once the bullet is above 1.5Sg (fully stable) then little variances to stability from changing bullet drag doesn't matter. It's when drag hits hard that strong stability is challenged. Like at transonic and animal impact. [/QUOTE]
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