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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Let's argue about BC's
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<blockquote data-quote="Jon A" data-source="post: 474285" data-attributes="member: 319"><p>At 3300 FPS the bullets will have a higher G1 BC than they will at 284 velocities. So it isn't surprising the AM users experience an observed G1 BC higher than the average Bryan got, especially only out to 1000 or so. Had he measured it out of an AM it likely would have gotten a higher G1 number (assuming he measured to the same distances) but the G7 number likely would have been very similar. This is one of the big reason to use G7 BC's as they should be more nearly constant for all MV's for bullets of this shape.</p><p></p><p>I used the JBM calculator with the data you showed and got BC's of .358 G7 or a .741 G1 which is right in line with what Bryan got. I think you double did the elevation/pressure somehow.</p><p></p><p>FWIW, don't feel bad, it's still an outstanding bullet. It's really not surprising to me it didn't quite make an honest .9 as I always kind of thought it wouldn't. It only has the equivalent SD of a 235 grain 30 cal. It still kicks but on anything else widely available in that caliber (or 30 caliber at the moment for that matter) by a long ways.</p></blockquote><p></p>
[QUOTE="Jon A, post: 474285, member: 319"] At 3300 FPS the bullets will have a higher G1 BC than they will at 284 velocities. So it isn’t surprising the AM users experience an observed G1 BC higher than the average Bryan got, especially only out to 1000 or so. Had he measured it out of an AM it likely would have gotten a higher G1 number (assuming he measured to the same distances) but the G7 number likely would have been very similar. This is one of the big reason to use G7 BC’s as they should be more nearly constant for all MV’s for bullets of this shape. I used the JBM calculator with the data you showed and got BC’s of .358 G7 or a .741 G1 which is right in line with what Bryan got. I think you double did the elevation/pressure somehow. FWIW, don’t feel bad, it’s still an outstanding bullet. It’s really not surprising to me it didn’t quite make an honest .9 as I always kind of thought it wouldn’t. It only has the equivalent SD of a 235 grain 30 cal. It still kicks but on anything else widely available in that caliber (or 30 caliber at the moment for that matter) by a long ways. [/QUOTE]
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Let's argue about BC's
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