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<blockquote data-quote="ajhardle" data-source="post: 665839" data-attributes="member: 49861"><p>Wildrose, I want to make sure we're on the same page. Two points we disagree on are 1. whether b.c. is more important than form factor ( aka shape), and 2. comparing apples to apples.</p><p>1. let's compare two bullets. The hornady 208 amax( great shape), and sierra's 240 gr. SMK. The hornady has a G7 bc of .325, and Bryan Litz tells us the Sierra's is .331. higher b.c.=lessdrift? let's see.</p><p>@2500fps the 208 amax has <strong>78.6</strong> inches of drift.</p><p>@2500fps the 240 smk has <strong>76.6</strong> inches of drift.</p><p>okay so higher b.c. means less drift, until we realize we are pushing the 240 at max pressure and we can still drive the 208 faster. assuming equivalent energy, the 208 can reach 2685fps.</p><p>@2685 the 208 has <strong>69.9</strong> inches of drift.</p><p>the reason for this is the 208 has a i7 form factor near .<strong>96</strong>, meaning less drag than the g7 model. The 240 smk has a form factor of <strong>1.092</strong>, more drag than the g7 model. The only reason the 240 bc is higher is because it is heavier, but because of shape, it is less ballisticaly efficient. Are you still with me?</p><p>......please include the bc's you are entering, sometimes manufacturers are way off. (and that's probably the reason for confusion)</p></blockquote><p></p>
[QUOTE="ajhardle, post: 665839, member: 49861"] Wildrose, I want to make sure we're on the same page. Two points we disagree on are 1. whether b.c. is more important than form factor ( aka shape), and 2. comparing apples to apples. 1. let's compare two bullets. The hornady 208 amax( great shape), and sierra's 240 gr. SMK. The hornady has a G7 bc of .325, and Bryan Litz tells us the Sierra's is .331. higher b.c.=lessdrift? let's see. @2500fps the 208 amax has [B]78.6[/B] inches of drift. @2500fps the 240 smk has [B]76.6[/B] inches of drift. okay so higher b.c. means less drift, until we realize we are pushing the 240 at max pressure and we can still drive the 208 faster. assuming equivalent energy, the 208 can reach 2685fps. @2685 the 208 has [B]69.9[/B] inches of drift. the reason for this is the 208 has a i7 form factor near .[B]96[/B], meaning less drag than the g7 model. The 240 smk has a form factor of [B]1.092[/B], more drag than the g7 model. The only reason the 240 bc is higher is because it is heavier, but because of shape, it is less ballisticaly efficient. Are you still with me? ......please include the bc's you are entering, sometimes manufacturers are way off. (and that's probably the reason for confusion) [/QUOTE]
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