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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Wind and it's affects?
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<blockquote data-quote="Mikecr" data-source="post: 417211" data-attributes="member: 1521"><p>This again is better another thread, because there ARE NOT multiple BCs for a given bullet. There is one true BC.</p><p></p><p>Sierra knows the true BC, but it does no good to provide it because our software does not utilize Sierra bullet drag coefficient curves. We use the G1 standard... So as a workaround, and to potentially provide corrections to weak software out there, Sierra provides adjustments. </p><p>Adjustments that likely screw us up more than anything..</p><p></p><p>Bryan really did the same with Bergers by averaging G1 adapted BCs over downrange values.</p><p>He did this to 'help' us, but it's bad science.</p><p>So there is a scary trend of simplifications & generalizations to better serve us, that skirt truths.</p><p>And to account/discount for these actions correctly, we must understand matters for ourselves.</p><p>For example, we must recognize that the 'easier' Miller stability formula is a rule of thumb only that does not represent all real truths. It will fail tests, and there is no particular reason that stability SHOULD be so easy.</p><p>So this leaves us with far more difficult McGyro math to understand. </p><p>It's on us to do so, or not.</p><p></p><p>Potential discussions for other threads..</p></blockquote><p></p>
[QUOTE="Mikecr, post: 417211, member: 1521"] This again is better another thread, because there ARE NOT multiple BCs for a given bullet. There is one true BC. Sierra knows the true BC, but it does no good to provide it because our software does not utilize Sierra bullet drag coefficient curves. We use the G1 standard... So as a workaround, and to potentially provide corrections to weak software out there, Sierra provides adjustments. Adjustments that likely screw us up more than anything.. Bryan really did the same with Bergers by averaging G1 adapted BCs over downrange values. He did this to 'help' us, but it's bad science. So there is a scary trend of simplifications & generalizations to better serve us, that skirt truths. And to account/discount for these actions correctly, we must understand matters for ourselves. For example, we must recognize that the 'easier' Miller stability formula is a rule of thumb only that does not represent all real truths. It will fail tests, and there is no particular reason that stability SHOULD be so easy. So this leaves us with far more difficult McGyro math to understand. It's on us to do so, or not. Potential discussions for other threads.. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Wind and it's affects?
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