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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BC Question?
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<blockquote data-quote="Michael Eichele" data-source="post: 82338" data-attributes="member: 1007"><p>Weight of course effects BC. More than weight is material which of course affects weight and velocity and therefore BC. Something else to consider is many differant materials have differant specifec gravity values. I think the reason Barnes publishes BC's so high is because I doubt they calculate the BC including specifec gravity and most likely base it on weight and form factor, most here will agree that their claims are quite optomistic. Solid copper has a very low specifec gravity value where jacketed lead has one of the best. a 178 AMAX will put a 180 X to shame despite Barnes claim of .552 for their 180 XBT and Hornaday's claim of .496 for the 178 AMAX. Any BC calculator you use calculates multiple factors for determining fairly close numbers. Any calculator worth its salt has a place for weight. A bullet with more weight with the same form, shape and size factors at same velocity as a lighter bullet should fly flatter due to increased energy. </p><p></p><p>Most of this idea would be because of differing specifec gravity values of various metals which of course changes weight quite drasticaly.</p><p></p><p>Hope that helps some.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 82338, member: 1007"] Weight of course effects BC. More than weight is material which of course affects weight and velocity and therefore BC. Something else to consider is many differant materials have differant specifec gravity values. I think the reason Barnes publishes BC's so high is because I doubt they calculate the BC including specifec gravity and most likely base it on weight and form factor, most here will agree that their claims are quite optomistic. Solid copper has a very low specifec gravity value where jacketed lead has one of the best. a 178 AMAX will put a 180 X to shame despite Barnes claim of .552 for their 180 XBT and Hornaday's claim of .496 for the 178 AMAX. Any BC calculator you use calculates multiple factors for determining fairly close numbers. Any calculator worth its salt has a place for weight. A bullet with more weight with the same form, shape and size factors at same velocity as a lighter bullet should fly flatter due to increased energy. Most of this idea would be because of differing specifec gravity values of various metals which of course changes weight quite drasticaly. Hope that helps some. [/QUOTE]
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