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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
G function question
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<blockquote data-quote="Jeff In TX" data-source="post: 36321" data-attributes="member: 1522"><p>Trader 388,</p><p></p><p>Sierra matchkings are truly boattail bullets and not VLD. They would use a G5 drag model, which was developed for boattails and not the G7, which was developed for VLD bullets. </p><p></p><p>I used my RSI ballistic program, which will convert bullet drag functions. I can also take the bullets dimensions and plug them into a drag model estimator, which will tell you what drag model is correct. The sierra boattails definitely fall under the G5 drag model.</p><p></p><p>Below is the G5 BC for the bullets your were asking about.</p><p></p><p>240gr. sierra match king G1 BC is .711 converted to G5 is .411</p><p></p><p>300gr. sierra match king G1 BC is 768 coverted to G5 is .477</p><p></p><p>Hope it helps</p></blockquote><p></p>
[QUOTE="Jeff In TX, post: 36321, member: 1522"] Trader 388, Sierra matchkings are truly boattail bullets and not VLD. They would use a G5 drag model, which was developed for boattails and not the G7, which was developed for VLD bullets. I used my RSI ballistic program, which will convert bullet drag functions. I can also take the bullets dimensions and plug them into a drag model estimator, which will tell you what drag model is correct. The sierra boattails definitely fall under the G5 drag model. Below is the G5 BC for the bullets your were asking about. 240gr. sierra match king G1 BC is .711 converted to G5 is .411 300gr. sierra match king G1 BC is 768 coverted to G5 is .477 Hope it helps [/QUOTE]
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G function question
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