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What's Wrong With .30 Caliber? By Bryan Litz
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<blockquote data-quote="WildcatB" data-source="post: 260704" data-attributes="member: 10379"><p>Mysticplayer,</p><p></p><p>This is a guess, and hopefully Bryan will correct me on this, but I think BC is a constant, and should be static from gun to gun, and even (when adjusted for) all other variables including pressure. However, in the real world, you'll get different measured values for different guns, different elevations (even when corrected for), plus other factors, for the same bullets. I think this is because, and again I'm guessing, the amount of time a bullet will take to stabilize, will change depending upon equipment and environmental factors. I've heard of a bullet that would stabilize at one elevation and key hole at another - same gun/load/bullet. I think all BC calculations assume that the bullet is stable right out of the barrel. But if it pitches and yaws for a while before is spirals tight, its velocity will decrease faster than it would if it was stable which should make a difference on measured BC.</p><p></p><p>Also, there is more than one way to skin a cat and I'm guessing that different bullet manufactures don't all use the same method for coming up with their BC's. </p><p></p><p>I enjoy Bryan's article's too. Hopefully he'll give us some more insight about differences in measured BC's.</p><p></p><p></p><p></p><p>Paul</p></blockquote><p></p>
[QUOTE="WildcatB, post: 260704, member: 10379"] Mysticplayer, This is a guess, and hopefully Bryan will correct me on this, but I think BC is a constant, and should be static from gun to gun, and even (when adjusted for) all other variables including pressure. However, in the real world, you'll get different measured values for different guns, different elevations (even when corrected for), plus other factors, for the same bullets. I think this is because, and again I'm guessing, the amount of time a bullet will take to stabilize, will change depending upon equipment and environmental factors. I've heard of a bullet that would stabilize at one elevation and key hole at another - same gun/load/bullet. I think all BC calculations assume that the bullet is stable right out of the barrel. But if it pitches and yaws for a while before is spirals tight, its velocity will decrease faster than it would if it was stable which should make a difference on measured BC. Also, there is more than one way to skin a cat and I'm guessing that different bullet manufactures don't all use the same method for coming up with their BC's. I enjoy Bryan's article's too. Hopefully he'll give us some more insight about differences in measured BC's. Paul [/QUOTE]
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What's Wrong With .30 Caliber? By Bryan Litz
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