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The Basics, Starting Out
Drag functions and drop charts
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<blockquote data-quote="Mikecr" data-source="post: 113448" data-attributes="member: 1521"><p>BC is dependent on drag. From the muzzle or any other point. It varies only because drag varies. The bullet's curve. BC could be used as a constant because of this, but it's used as a variable in software. Unless some other decay factor is used. From what I've seen, it's often used wrong(like using a G1 BC WITH a G7 drag curve, or claiming a ridiculous G1 BC from a bullet which is really following G7 curve at a G7 BC)</p><p>Adjustment of a bullet's drag curve to match in ballistic software would be great. Seems like someone was working on this with what they called a 'DK' adjustment(bain). It flattened the curve to match field observed drops at different distances.Not just 2 distances either. Far superior to BC adjustment, which can only actually be correct at 2 points. Sierra's BCs at different velocities offers potential for more, close points. A pretty poor bandaid, but what else could they do given that nearly all ballistic software available has set drag curves which do not match our bullets. The only control Sierra has over this market is in their BC numbers.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 113448, member: 1521"] BC is dependent on drag. From the muzzle or any other point. It varies only because drag varies. The bullet's curve. BC could be used as a constant because of this, but it's used as a variable in software. Unless some other decay factor is used. From what I've seen, it's often used wrong(like using a G1 BC WITH a G7 drag curve, or claiming a ridiculous G1 BC from a bullet which is really following G7 curve at a G7 BC) Adjustment of a bullet's drag curve to match in ballistic software would be great. Seems like someone was working on this with what they called a 'DK' adjustment(bain). It flattened the curve to match field observed drops at different distances.Not just 2 distances either. Far superior to BC adjustment, which can only actually be correct at 2 points. Sierra's BCs at different velocities offers potential for more, close points. A pretty poor bandaid, but what else could they do given that nearly all ballistic software available has set drag curves which do not match our bullets. The only control Sierra has over this market is in their BC numbers. [/QUOTE]
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Drag functions and drop charts
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