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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Let's argue about BC's
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<blockquote data-quote="Jon A" data-source="post: 474741" data-attributes="member: 319"><p>Of course it is. You are measuring two different things. Why would you expect them to match?</p><p></p><p>Drop at 750 from a 300 yds zero is absolutely and completely meaningless as a method of verifying BC's.</p><p></p><p>But they should, if we're all doing it right. Unless there's something wrong with a rifle/bullet combination used by one of the people measuring, if they all do it right they should all get the same answer (within a certain amount of variability). </p><p></p><p>But like I said, you have to be measuring the same thing. My own measurements have been very close to Bryan's. At first blush they may not be but that's only because mine are relatively incomplete. A G1 BC I've measured over 200 yds certainly won't match his <em>average for its entire flight.</em> But when you look at the BC he measured at the velocity I did, it's usually right in there with what I measured.</p><p></p><p>With most of the bullets we use, simply using G7's fixes that for the most part as it stays more constant. With some bullets that don't follow that curve or the G1 curve very well, however, you won't get a complete picture unless you measure the bullet over the entire velocity range as he does. That doesn't mean my measurement was wrong, it was just incomplete.</p><p></p><p>He did. And it matched Bryan's numbers almost exactly.</p></blockquote><p></p>
[QUOTE="Jon A, post: 474741, member: 319"] Of course it is. You are measuring two different things. Why would you expect them to match? Drop at 750 from a 300 yds zero is absolutely and completely meaningless as a method of verifying BC's. But they should, if we're all doing it right. Unless there's something wrong with a rifle/bullet combination used by one of the people measuring, if they all do it right they should all get the same answer (within a certain amount of variability). But like I said, you have to be measuring the same thing. My own measurements have been very close to Bryan's. At first blush they may not be but that's only because mine are relatively incomplete. A G1 BC I've measured over 200 yds certainly won't match his [i]average for its entire flight.[/i] But when you look at the BC he measured at the velocity I did, it's usually right in there with what I measured. With most of the bullets we use, simply using G7's fixes that for the most part as it stays more constant. With some bullets that don't follow that curve or the G1 curve very well, however, you won't get a complete picture unless you measure the bullet over the entire velocity range as he does. That doesn't mean my measurement was wrong, it was just incomplete. He did. And it matched Bryan's numbers almost exactly. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Let's argue about BC's
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