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Hunting
Long Range Hunting & Shooting
Improving the 308 Win performance
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<blockquote data-quote="nralifer" data-source="post: 2697020" data-attributes="member: 94556"><p>Ok. Sorry. In the 30 cal we don't primarily because of the larger cross sectional area. In smaller calibers, like the .277 we have a150 gr bullet with a G1 of 0.710. As a general rule for the same weight bullet, because of the smaller cross sectional area you can fashion a longer thinner bullet whose BC will be higher, but the larger caliber ultimately will produce heavier bullets with much higher BCs. A good example is a 6mm and a .510 caliber. The highest G1 we can get out of a 6mm is 0.61which weighs 105 gr but needs a 1:7 or preferably a 1:6 twist to stabilize it. From the 50 cal we have made an 875 gr with a G1BC of 1.32 needing a 1:12 twist to stabilize. Recoil is ferocious even with a large muzzle brake and a 50 lb rifle. Another limitation is that when a bullet is over 6 calibers long they start to exhibit erratic long range behavior.</p></blockquote><p></p>
[QUOTE="nralifer, post: 2697020, member: 94556"] Ok. Sorry. In the 30 cal we don’t primarily because of the larger cross sectional area. In smaller calibers, like the .277 we have a150 gr bullet with a G1 of 0.710. As a general rule for the same weight bullet, because of the smaller cross sectional area you can fashion a longer thinner bullet whose BC will be higher, but the larger caliber ultimately will produce heavier bullets with much higher BCs. A good example is a 6mm and a .510 caliber. The highest G1 we can get out of a 6mm is 0.61which weighs 105 gr but needs a 1:7 or preferably a 1:6 twist to stabilize it. From the 50 cal we have made an 875 gr with a G1BC of 1.32 needing a 1:12 twist to stabilize. Recoil is ferocious even with a large muzzle brake and a 50 lb rifle. Another limitation is that when a bullet is over 6 calibers long they start to exhibit erratic long range behavior. [/QUOTE]
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Improving the 308 Win performance
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