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Rifles, Reloading, Optics, Equipment
Reloading
Do you consider Sectional Density when choosing a bullet?
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<blockquote data-quote="StanleyActual" data-source="post: 2273883" data-attributes="member: 119220"><p>Eh not so much, but I do pay attention to the BC. You can't have a good BC without a good SD</p><p></p><p> 3 elements that make up your BC</p><p></p><p>1. Bullet Weight</p><p>2. Cross Sectional</p><p>3. Form Factor ( drag coefficient of your projectile divided by drag coefficient of the G1 or G7 projectile) This is the element that causes your BC to change with velocity because its velocity based. As it slows, the drag coefficient increases until you hit trans / subsonic, where both velocity and drag drop off</p><p></p><p>bullet weight in lbs / caliber (inches) * caliber (in inches) * FF</p><p></p><p>= Ballistic Coefficient</p><p></p><p>Bullet weight and cross sectional area is what gives you your SD</p><p></p><p>you'll notice that when you look at the G7 BC for your projectile, it's VERY close if not the same as the advertised SD</p><p></p><p>Your sectional density is the G7 BC minus the Form Factor (Drag coefficients). You can't have a good BC without having a good SD.</p></blockquote><p></p>
[QUOTE="StanleyActual, post: 2273883, member: 119220"] Eh not so much, but I do pay attention to the BC. You can’t have a good BC without a good SD 3 elements that make up your BC 1. Bullet Weight 2. Cross Sectional 3. Form Factor ( drag coefficient of your projectile divided by drag coefficient of the G1 or G7 projectile) This is the element that causes your BC to change with velocity because its velocity based. As it slows, the drag coefficient increases until you hit trans / subsonic, where both velocity and drag drop off bullet weight in lbs / caliber (inches) * caliber (in inches) * FF = Ballistic Coefficient Bullet weight and cross sectional area is what gives you your SD you’ll notice that when you look at the G7 BC for your projectile, it’s VERY close if not the same as the advertised SD Your sectional density is the G7 BC minus the Form Factor (Drag coefficients). You can’t have a good BC without having a good SD. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Do you consider Sectional Density when choosing a bullet?
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