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The Basics, Starting Out
CALIBER CHOICES
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<blockquote data-quote="milanuk" data-source="post: 52007" data-attributes="member: 376"><p><BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR><strong></strong></p><p> <strong>Actually, BC is a direct function of the weight of the bullet. Length has little to do with it (except that heavy bullets tend to be longer, aerodynamic shapes--long ogives, sharp points and boattails--tend to make the bullets longer). The length of the bullet itself, with other factors held constant has only a small contribution to drag.</strong></p><p><strong></strong><HR></BLOCKQUOTE></p><p></p><p>Not saying that I'm not wrong in one sense or another, but then exactly how do you explain the bullets like the Lapua Scenar 155gr? AFAIK (I haven't personally vivisected one) they have a BC very close to a 175gr SMK, for instance, and a similar lenght. But one is 20gr lighter than the other. The 155 Scenar is as long as it is because the nose is effectively hollow, due to the lack of lead to make weight. This would seem to indicate to me that the length of the bullet, and more precisely how its shape corresponds to the 'ideal' bullet (G1 or whatever it is) that affects the BC. The weight would seem to be a side effect of filling up the voids w/ lead.</p><p></p><p>YMMV,</p><p></p><p>Monte</p></blockquote><p></p>
[QUOTE="milanuk, post: 52007, member: 376"] <BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR>[B] Actually, BC is a direct function of the weight of the bullet. Length has little to do with it (except that heavy bullets tend to be longer, aerodynamic shapes--long ogives, sharp points and boattails--tend to make the bullets longer). The length of the bullet itself, with other factors held constant has only a small contribution to drag. [/B]<HR></BLOCKQUOTE> Not saying that I'm not wrong in one sense or another, but then exactly how do you explain the bullets like the Lapua Scenar 155gr? AFAIK (I haven't personally vivisected one) they have a BC very close to a 175gr SMK, for instance, and a similar lenght. But one is 20gr lighter than the other. The 155 Scenar is as long as it is because the nose is effectively hollow, due to the lack of lead to make weight. This would seem to indicate to me that the length of the bullet, and more precisely how its shape corresponds to the 'ideal' bullet (G1 or whatever it is) that affects the BC. The weight would seem to be a side effect of filling up the voids w/ lead. YMMV, Monte [/QUOTE]
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