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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Introducing Cutting Edge Bullet's new LAZER high BC copper hunting bullet
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<blockquote data-quote="Michael Eichele" data-source="post: 835612" data-attributes="member: 1007"><p>Physics say it is dang near impossible to make a .308" diameter/180 grain bullet to reach the .600 BC mark unless you're driving them stupid fast. Around 3000'/sec, you're stuck with around .575. That's assuming it has a form factor equal to the 210VLD or the 208 Amax which is hard to do with jacketed lead in a 180 grain bullet. You can't have that much nose and boat tail and have adequate bearing surface. Since solid copper has roughly only 86% the specifec gravity of jacketed lead, it's more feasible to achieve a form factor equal to the 208/210s. Simply put, making a copper bullet the same dimensions as a 208 Amax, you'd end up with a bullet weight close to 180 grains. With that in mind, the lower section density of the 180 versus the 208 will limit its BC to around .575. Still not bad. I'd be happy with a 180 that had a BC of .575. If they'd expand at 1500'sec, I'd actually buy some.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 835612, member: 1007"] Physics say it is dang near impossible to make a .308" diameter/180 grain bullet to reach the .600 BC mark unless you're driving them stupid fast. Around 3000'/sec, you're stuck with around .575. That's assuming it has a form factor equal to the 210VLD or the 208 Amax which is hard to do with jacketed lead in a 180 grain bullet. You can't have that much nose and boat tail and have adequate bearing surface. Since solid copper has roughly only 86% the specifec gravity of jacketed lead, it's more feasible to achieve a form factor equal to the 208/210s. Simply put, making a copper bullet the same dimensions as a 208 Amax, you'd end up with a bullet weight close to 180 grains. With that in mind, the lower section density of the 180 versus the 208 will limit its BC to around .575. Still not bad. I'd be happy with a 180 that had a BC of .575. If they'd expand at 1500'sec, I'd actually buy some. [/QUOTE]
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Introducing Cutting Edge Bullet's new LAZER high BC copper hunting bullet
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