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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How important is bc?
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<blockquote data-quote="RockyMtnMT" data-source="post: 357469" data-attributes="member: 7999"><p>I will have to agree that the boat tail does more for wind drift than I thought. The consensus is that the boat tail is directly responsible for the bullets wind drift.</p><p> </p><p>I ran some #'s on two drastically different hunting bullets that pretty much backs up what everyone has said about bc's.</p><p> </p><p>7mm Nosler AB 160g bc=.531 </p><p>7mm RuM</p><p>3300 fps mv</p><p>3000 ft elev.</p><p>40 deg temp</p><p>300yrd zero</p><p>600yrd drop=39.4" or 6.3 moa</p><p>600yrd drift=18.8" or 3 moa (10mph)</p><p>vel=2318fps</p><p>1000yrd drop=188.3" or 18moa</p><p>1000yrd drift=59.2" or 5.7moa</p><p>vel=1772.3fps</p><p> </p><p>7mm GS HV 120g bc=.390</p><p>Same rifle and atmosphere</p><p>4200 fps mv</p><p>600yrd drop=26.8" or 4.3 moa</p><p>600yrd drift=20.1" or 3.2 moa</p><p>vel=2653.2fps</p><p>1000yrd drop=138" or 13.2 moa</p><p>1000yrd drift=64.9" or 6.2 moa</p><p>vel=1867fps</p><p> </p><p>Interesting to compare.</p><p> </p><p>Steve</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 357469, member: 7999"] I will have to agree that the boat tail does more for wind drift than I thought. The consensus is that the boat tail is directly responsible for the bullets wind drift. I ran some #'s on two drastically different hunting bullets that pretty much backs up what everyone has said about bc's. 7mm Nosler AB 160g bc=.531 7mm RuM 3300 fps mv 3000 ft elev. 40 deg temp 300yrd zero 600yrd drop=39.4" or 6.3 moa 600yrd drift=18.8" or 3 moa (10mph) vel=2318fps 1000yrd drop=188.3" or 18moa 1000yrd drift=59.2" or 5.7moa vel=1772.3fps 7mm GS HV 120g bc=.390 Same rifle and atmosphere 4200 fps mv 600yrd drop=26.8" or 4.3 moa 600yrd drift=20.1" or 3.2 moa vel=2653.2fps 1000yrd drop=138" or 13.2 moa 1000yrd drift=64.9" or 6.2 moa vel=1867fps Interesting to compare. Steve [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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How important is bc?
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