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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: 983498" data-attributes="member: 28191"><p>Most experts in external ballistics discount inferring BCs based on drop data in favor of the two accepted reliable methods of using a near and far velocity measurement and using a near velocity measurement and an accurate time of flight over a known distance. When these methods are used, together with measured environmental conditions and entering the data into a reliable BC calculator, an accurate BC can be determined. </p><p></p><p>We use the near and far velocity method with chronographs calibrated to be accurate within 0.1%, chronograph separation measured with a tape measure accurate to within 3 inches, environmental conditions determined with a Kestrel 4500, and the JBM ballistics calculator. We also determine the BC for each of a number of shots which allows us not only to report the BC for a given near velocity but also to report the uncertainty in the BC. Our results correspond very closely with the published specifications of the Hornady AMAX and VMAX bullets that we have tested, but we tend to find bigger differences from published claims when testing other bullets.</p><p></p><p>If you can, please cite reliable results from using one of these two accepted methods, and we'll be happy to review the data for the specific bullets for which independent testing is available.</p></blockquote><p></p>
[QUOTE="Michael Courtney, post: 983498, member: 28191"] Most experts in external ballistics discount inferring BCs based on drop data in favor of the two accepted reliable methods of using a near and far velocity measurement and using a near velocity measurement and an accurate time of flight over a known distance. When these methods are used, together with measured environmental conditions and entering the data into a reliable BC calculator, an accurate BC can be determined. We use the near and far velocity method with chronographs calibrated to be accurate within 0.1%, chronograph separation measured with a tape measure accurate to within 3 inches, environmental conditions determined with a Kestrel 4500, and the JBM ballistics calculator. We also determine the BC for each of a number of shots which allows us not only to report the BC for a given near velocity but also to report the uncertainty in the BC. Our results correspond very closely with the published specifications of the Hornady AMAX and VMAX bullets that we have tested, but we tend to find bigger differences from published claims when testing other bullets. If you can, please cite reliable results from using one of these two accepted methods, and we'll be happy to review the data for the specific bullets for which independent testing is available. [/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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