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Wind and Spindrift
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<blockquote data-quote="User4302021" data-source="post: 1635854" data-attributes="member: 105322"><p>As I understand it, there is great interplay between Sg and CD in determining that. Longer bullets with higher BC's require greater twist, which (all else remaining equal) increases the angular momentum, which increases potential for drift.</p><p></p><p>However, if greater stability (2.0 Sg or higher) can be achieved without damage to the structural integrity of the bullet, then the long cycle coning motion around the mean axis of trajectory can be decreased. This increases the BC further, which shortens flight time, which decreases the time the bullet has for drift. Thus, it offsets the increased angular moment to differing degrees depending on the combination.</p><p></p><p>I was using 1% for my fast twist 1/8.5 338AX out to 2,400 yards, and 2% for my 308 Win out to 1200 yards.</p><p></p><p>But what I am coming around to presently, is just using 1.5% for all and just realize that the error will be so much smaller than the other variables I have to worry about, that it isn't worth fretting over.</p></blockquote><p></p>
[QUOTE="User4302021, post: 1635854, member: 105322"] As I understand it, there is great interplay between Sg and CD in determining that. Longer bullets with higher BC's require greater twist, which (all else remaining equal) increases the angular momentum, which increases potential for drift. However, if greater stability (2.0 Sg or higher) can be achieved without damage to the structural integrity of the bullet, then the long cycle coning motion around the mean axis of trajectory can be decreased. This increases the BC further, which shortens flight time, which decreases the time the bullet has for drift. Thus, it offsets the increased angular moment to differing degrees depending on the combination. I was using 1% for my fast twist 1/8.5 338AX out to 2,400 yards, and 2% for my 308 Win out to 1200 yards. But what I am coming around to presently, is just using 1.5% for all and just realize that the error will be so much smaller than the other variables I have to worry about, that it isn't worth fretting over. [/QUOTE]
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