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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
calculating bc
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<blockquote data-quote="Mikecr" data-source="post: 453793" data-attributes="member: 1521"><p>arrow, I don't believe there exists an 'easy way' to predict BC(no rules of thumb). Nor is there an easy way to measure it, or even express it!</p><p></p><p>The BC formula FEENIX brought in seems simple because it represents only a portion of work involved(the end calc). The "CB" in that formula(or CDtotal, or actual bullet total drag -at your velocities and conditions) does not just fall out of the sky into anyones hands...</p><p>Try a calc here for CD to get an idea-> <a href="http://www.jbmballistics.com/ballistics/calculators/calculators.shtml" target="_blank">JBM - Calculations</a></p><p></p><p>Here you'll find roadblocks like 'ogive radius' which is unknown and not easy to measure & determine with secant ogives. You'll find that meplat diameters matter pretty quick, and that they are difficult to measure with precision needed. Then there is more hidden work, as any BC figured has to be adjusted for air density and muzzle velocity..</p><p></p><p>And measuring BC is no simple task..</p><p>And correctly using/expressing the BC you hold is no simple task..</p><p>Yadda, yadda</p></blockquote><p></p>
[QUOTE="Mikecr, post: 453793, member: 1521"] arrow, I don't believe there exists an 'easy way' to predict BC(no rules of thumb). Nor is there an easy way to measure it, or even express it! The BC formula FEENIX brought in seems simple because it represents only a portion of work involved(the end calc). The "CB" in that formula(or CDtotal, or actual bullet total drag -at your velocities and conditions) does not just fall out of the sky into anyones hands... Try a calc here for CD to get an idea-> [url=http://www.jbmballistics.com/ballistics/calculators/calculators.shtml]JBM - Calculations[/url] Here you'll find roadblocks like 'ogive radius' which is unknown and not easy to measure & determine with secant ogives. You'll find that meplat diameters matter pretty quick, and that they are difficult to measure with precision needed. Then there is more hidden work, as any BC figured has to be adjusted for air density and muzzle velocity.. And measuring BC is no simple task.. And correctly using/expressing the BC you hold is no simple task.. Yadda, yadda [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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calculating bc
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