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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Changed Berger B.C.
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<blockquote data-quote="goodgrouper" data-source="post: 244802" data-attributes="member: 2852"><p>Bryan,</p><p></p><p>Thank you for your response. I have been anxiously awaiting getting back to the 'puter all day to see how the thread has gone.</p><p></p><p>In reality, if it's only a 4-5% reduction in BC, that would not be too bad. Most guns and/or shooters aren't accurate enough to split the difference at of a few inches at 1000 yards. But that box of 210's had me going! When my customer read me the bc off the box, I thought he had bought the wrong dang bullets! "It should say 6 something not 5 something" I told him. But he reaffirmed that it was a .5 something. It wasn't tell I pulled one out of the box and looked at it that I knew it truly was the 210 grain VLD.</p><p></p><p>And thank you for the explanation of the testing facilities. 600 yards would indeed be far enough to get an accurate measurement. And so, if that is what your getting, then I can swallow it. I guess my elevation (5000 feet) just simply happened to match the old BC's almost perfectly. Just for curiosity sake, what is the elevation at your range?</p><p></p><p>The tests I referred to just fyi were calculated throughout the trajectory from the bore to the transonic state and some went even beyond that. The basic result of the testing was to show how the longer bullets accentuate the yaw of repose over a longer distance and time. As I'm sure you know, every bullet yaws at it's first initial release of the muzzle including the short, little stubby bullets used in short range benchrest. They simply don't exhibit it for very long or for much distance and therefore are totally point on by 100 yards or less thus the great short range accuracy. But the long bullets just don't act that way at 100 yards or even sometimes 300 yards. Therefore, the testing ( the Aberdeen dopplar test in particular) showed that the bc of these bullets started out at "x" bc and then increased downrange, and then some of the bullets even went x-y in the transonic, then became x again in sub sonic states. But most just went up in bc until they leveled off then they hit the ground.</p><p></p><p>Anywhoo, good luck on the testing and by all means, please keep us informed!</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 244802, member: 2852"] Bryan, Thank you for your response. I have been anxiously awaiting getting back to the 'puter all day to see how the thread has gone. In reality, if it's only a 4-5% reduction in BC, that would not be too bad. Most guns and/or shooters aren't accurate enough to split the difference at of a few inches at 1000 yards. But that box of 210's had me going! When my customer read me the bc off the box, I thought he had bought the wrong dang bullets! "It should say 6 something not 5 something" I told him. But he reaffirmed that it was a .5 something. It wasn't tell I pulled one out of the box and looked at it that I knew it truly was the 210 grain VLD. And thank you for the explanation of the testing facilities. 600 yards would indeed be far enough to get an accurate measurement. And so, if that is what your getting, then I can swallow it. I guess my elevation (5000 feet) just simply happened to match the old BC's almost perfectly. Just for curiosity sake, what is the elevation at your range? The tests I referred to just fyi were calculated throughout the trajectory from the bore to the transonic state and some went even beyond that. The basic result of the testing was to show how the longer bullets accentuate the yaw of repose over a longer distance and time. As I'm sure you know, every bullet yaws at it's first initial release of the muzzle including the short, little stubby bullets used in short range benchrest. They simply don't exhibit it for very long or for much distance and therefore are totally point on by 100 yards or less thus the great short range accuracy. But the long bullets just don't act that way at 100 yards or even sometimes 300 yards. Therefore, the testing ( the Aberdeen dopplar test in particular) showed that the bc of these bullets started out at "x" bc and then increased downrange, and then some of the bullets even went x-y in the transonic, then became x again in sub sonic states. But most just went up in bc until they leveled off then they hit the ground. Anywhoo, good luck on the testing and by all means, please keep us informed! [/QUOTE]
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Changed Berger B.C.
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