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Do Bullets Go To Sleep?
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<blockquote data-quote="Michael Courtney" data-source="post: 835370" data-attributes="member: 28191"><p>Personally, I think most long range hunters should be measuring the BCs of their chosen hunting loads. We've measured a lot of BCs and also thoroughly reviewed the results of all the BCs measured by Litz and reported in his book on Applied Ballistics (highly recommended). BCs routinely can be 10-15% different from manufacturer claims (usually lower), can vary with the rifle the bullets are shot from, and are sometimes more than 40% lower than manufacturer claims. Using a BC from manufacturer claims, or even independently measured BCs from Litz or us can lead to unexpected performance at long range.</p><p></p><p>Some folks think about BC just in terms of drop and fail to consider that lower than expected BC also means greater wind drift and lower impact velocity. </p><p></p><p>Measuring your own BCs is as easy as adding a second chronograph to a standard long range shooting setup. With 0.3% accuracy, the CED Millenium has worked well for us, though we perform an extra calibration step to improve the relative accuracy for near and far velocities to 0.1%. (Probably not needed for most long range shooters). If the chronographs are spaced a carefully measured 100 yards apart, you can accurately determined the BCs of your bullets from your rifle by entering the near and far velocities in the JBM BC calculator along with the environmental conditions.</p></blockquote><p></p>
[QUOTE="Michael Courtney, post: 835370, member: 28191"] Personally, I think most long range hunters should be measuring the BCs of their chosen hunting loads. We've measured a lot of BCs and also thoroughly reviewed the results of all the BCs measured by Litz and reported in his book on Applied Ballistics (highly recommended). BCs routinely can be 10-15% different from manufacturer claims (usually lower), can vary with the rifle the bullets are shot from, and are sometimes more than 40% lower than manufacturer claims. Using a BC from manufacturer claims, or even independently measured BCs from Litz or us can lead to unexpected performance at long range. Some folks think about BC just in terms of drop and fail to consider that lower than expected BC also means greater wind drift and lower impact velocity. Measuring your own BCs is as easy as adding a second chronograph to a standard long range shooting setup. With 0.3% accuracy, the CED Millenium has worked well for us, though we perform an extra calibration step to improve the relative accuracy for near and far velocities to 0.1%. (Probably not needed for most long range shooters). If the chronographs are spaced a carefully measured 100 yards apart, you can accurately determined the BCs of your bullets from your rifle by entering the near and far velocities in the JBM BC calculator along with the environmental conditions. [/QUOTE]
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