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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger Bullets Announces Launch of a New Ammo Company
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<blockquote data-quote="Michael Courtney" data-source="post: 983541" data-attributes="member: 28191"><p>I have not said that most Berger bullets are off by at least 8%. I said most of the ones we've published our measurements on are off by that much. I have an open mind regarding the accuracy of Berger's BCs that we have not measured. </p><p></p><p>You're right that with careful attention to enough details, at some point BC errors will show up in drop predictions. But you probably aren't really measuring drop below the line of sight, you are measuring the scope adjustment needed to correct the drop between two distances. Also, we would tend to reject BC measurements based on altitude and temperature, even when using the more accurate near and far velocity measurement method or near velocity and time of flight.</p><p></p><p>At a given altitude and temperature, air density can change by 5% or more due to changes in humidity and barometric pressure. For this reason, the most dependable BC measurements measure all the ambient conditions directly (air pressure, humidity, and temperature) and compute the most accurate air density possible to yield BC measurements good to 1% or so. A 5% error in air density will contribute a 5% error in the ballistic coefficient. Carelessness with this and a host of other essential details is why drop based BC inferences are widely rejected.</p></blockquote><p></p>
[QUOTE="Michael Courtney, post: 983541, member: 28191"] I have not said that most Berger bullets are off by at least 8%. I said most of the ones we've published our measurements on are off by that much. I have an open mind regarding the accuracy of Berger's BCs that we have not measured. You're right that with careful attention to enough details, at some point BC errors will show up in drop predictions. But you probably aren't really measuring drop below the line of sight, you are measuring the scope adjustment needed to correct the drop between two distances. Also, we would tend to reject BC measurements based on altitude and temperature, even when using the more accurate near and far velocity measurement method or near velocity and time of flight. At a given altitude and temperature, air density can change by 5% or more due to changes in humidity and barometric pressure. For this reason, the most dependable BC measurements measure all the ambient conditions directly (air pressure, humidity, and temperature) and compute the most accurate air density possible to yield BC measurements good to 1% or so. A 5% error in air density will contribute a 5% error in the ballistic coefficient. Carelessness with this and a host of other essential details is why drop based BC inferences are widely rejected. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger Bullets Announces Launch of a New Ammo Company
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