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Ballistic Coefficient Question
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<blockquote data-quote="Broz" data-source="post: 900764" data-attributes="member: 7503"><p>Couple things I will offer here from my data.</p><p> </p><p>Yes Berger missed on their first attempt with the 300 gr 338. I was one of the first to report this or at least bring it to their attention. But they nailed the 7mm 180's , 30 cal 210's, 215's and 230's and the revised .388 300's. As well as almost every bullet I have used of theirs. Much better than some other manufacturers have done by a hell of a long ways. So I too may be a little in doubt of the initial proposed .795 BC of the 195 gr. But lets be fair about it, their track record is second to none.</p><p> </p><p>The addition of 5 gr of weight with the 215 Hybrid over the 210 VLD resulted in the 215 being a faster bullet with a lighter powder charge. However the 230 Hybrid is substantially slower than the 210 or 215 from a 300 win. So 15 gr made a huge difference here between the 215 and 230 as far as velocity from a 300 win. I suspect this is related to bearing surface. Can we assume the added 15 gr of the 7mm 195 over the 180 will result in the same ?? maybe, or maybe not quite as much as we think. I have the measurements for the 195 but would need to revisit them to compare bearing surface lengths. But again off memory I believe I have a 7mm-300 win reamer right here that will be perfect. I am just as anxious as the next guy to test the 195's. It just could be what moves me from the 300 win I love to a 7mm-300 win. But first I want my own tests of the 195's and a confirmed BC over 750 +. .795 would be pretty awesome at 3150~3200 fps. I know for a fact, I have a 338 that is in this class now.</p><p> </p><p> </p><p>Jeff</p></blockquote><p></p>
[QUOTE="Broz, post: 900764, member: 7503"] Couple things I will offer here from my data. Yes Berger missed on their first attempt with the 300 gr 338. I was one of the first to report this or at least bring it to their attention. But they nailed the 7mm 180's , 30 cal 210's, 215's and 230's and the revised .388 300's. As well as almost every bullet I have used of theirs. Much better than some other manufacturers have done by a hell of a long ways. So I too may be a little in doubt of the initial proposed .795 BC of the 195 gr. But lets be fair about it, their track record is second to none. The addition of 5 gr of weight with the 215 Hybrid over the 210 VLD resulted in the 215 being a faster bullet with a lighter powder charge. However the 230 Hybrid is substantially slower than the 210 or 215 from a 300 win. So 15 gr made a huge difference here between the 215 and 230 as far as velocity from a 300 win. I suspect this is related to bearing surface. Can we assume the added 15 gr of the 7mm 195 over the 180 will result in the same ?? maybe, or maybe not quite as much as we think. I have the measurements for the 195 but would need to revisit them to compare bearing surface lengths. But again off memory I believe I have a 7mm-300 win reamer right here that will be perfect. I am just as anxious as the next guy to test the 195's. It just could be what moves me from the 300 win I love to a 7mm-300 win. But first I want my own tests of the 195's and a confirmed BC over 750 +. .795 would be pretty awesome at 3150~3200 fps. I know for a fact, I have a 338 that is in this class now. Jeff [/QUOTE]
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