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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5mm - 25cal = .007"
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<blockquote data-quote="cdherman" data-source="post: 3077902" data-attributes="member: 12282"><p>I did NOT read all 15 pages. But I can say this, which perhaps has already been said, but here goes.</p><p></p><p>Ever notice that BC seems worse and worse the smaller diameter the projectile is? Even though we have some crazy long 6.5 (.264) heavy projectiles, they trail the .284 heaviest offerings in terms of BC. And in turn, there are .308 that outshine the .284, and .338 that are just crazy.</p><p></p><p>Why? Because we do NOT tend to shoot monolithic bullets long range. We shoot lead core, copper jacket. And therein lies the problem. As the bullet diameter gets smaller, the relative proportion of the bullets weight that is derived from the less dense copper goes up. This is assuming the copper jacket remains the same thickness, which is generally a necessity in a hunting bullet.</p><p></p><p>We all know that copper monolithic bullets have a poorer BC that a same weight lead/copper bullet. Cause the copper is less dense and thus there is more surface area and drag.</p><p></p><p>As bullets get smaller and smaller diameter wise, their density suffers because they are proportionally more and more copper and not lead. You just will never get a .223 bullet that can match the BC of .264. And for that matter, even though .257 is very close to .264, you are giving up a bit of BC.</p><p></p><p>Practically, I think .264 is the sweet spot for practical hunting long ranges on deer sized game.</p></blockquote><p></p>
[QUOTE="cdherman, post: 3077902, member: 12282"] I did NOT read all 15 pages. But I can say this, which perhaps has already been said, but here goes. Ever notice that BC seems worse and worse the smaller diameter the projectile is? Even though we have some crazy long 6.5 (.264) heavy projectiles, they trail the .284 heaviest offerings in terms of BC. And in turn, there are .308 that outshine the .284, and .338 that are just crazy. Why? Because we do NOT tend to shoot monolithic bullets long range. We shoot lead core, copper jacket. And therein lies the problem. As the bullet diameter gets smaller, the relative proportion of the bullets weight that is derived from the less dense copper goes up. This is assuming the copper jacket remains the same thickness, which is generally a necessity in a hunting bullet. We all know that copper monolithic bullets have a poorer BC that a same weight lead/copper bullet. Cause the copper is less dense and thus there is more surface area and drag. As bullets get smaller and smaller diameter wise, their density suffers because they are proportionally more and more copper and not lead. You just will never get a .223 bullet that can match the BC of .264. And for that matter, even though .257 is very close to .264, you are giving up a bit of BC. Practically, I think .264 is the sweet spot for practical hunting long ranges on deer sized game. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5mm - 25cal = .007"
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