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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Difference in bc between lead and monometal bullets?
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<blockquote data-quote="benchracer" data-source="post: 1277826" data-attributes="member: 22069"><p>Attached is a photo containing several 375 bullets. The two bullets furthest right are the Cutting Edge 300 MTH and the Sierra 350 Matchking. They are very close in length and generally appear as though they would have a very similar form factor.</p><p></p><p>Based on the Litz data for the 350 SMK (see attached screenshot), the average G7 bc is .380 (.741 G1). Assuming the same form factor, the CE 300 MTH should have a lower bc because it is made of less dense material. CE lists the G1 bc for this bullet @ .750, which I believe to be high (based on Litz's data for the 350 SMK).</p><p></p><p>I looked up the formula for bc and found this: </p><p></p><p>BC = Sectional Density (SD)/ Form Factor (i)</p><p></p><p>SD = Projectile Mass in grains (M)/7000 * the square of the Bullet Diameter in Inches</p><p></p><p></p><p>When I plugged in the data, I ended up with a calculated G7 bc for the CE 300 MTH of .325, which corresponds roughly to a .634 G1.</p><p></p><p>Did I calculate this correctly? Do these figures seem like a reasonable estimate?</p></blockquote><p></p>
[QUOTE="benchracer, post: 1277826, member: 22069"] Attached is a photo containing several 375 bullets. The two bullets furthest right are the Cutting Edge 300 MTH and the Sierra 350 Matchking. They are very close in length and generally appear as though they would have a very similar form factor. Based on the Litz data for the 350 SMK (see attached screenshot), the average G7 bc is .380 (.741 G1). Assuming the same form factor, the CE 300 MTH should have a lower bc because it is made of less dense material. CE lists the G1 bc for this bullet @ .750, which I believe to be high (based on Litz's data for the 350 SMK). I looked up the formula for bc and found this: BC = Sectional Density (SD)/ Form Factor (i) SD = Projectile Mass in grains (M)/7000 * the square of the Bullet Diameter in Inches When I plugged in the data, I ended up with a calculated G7 bc for the CE 300 MTH of .325, which corresponds roughly to a .634 G1. Did I calculate this correctly? Do these figures seem like a reasonable estimate? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Difference in bc between lead and monometal bullets?
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