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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: 982877" data-attributes="member: 28191"><p>See the screenshot of the distribution statement from the last paper. Due to contract obligations, non-disclosure agreements, and DoD rules, most of our research is subject to an approval process prior to publication. The approval process varies a bit over time, but our last BC paper required an internal peer-review by several DoD scientists, approval by my DoD chain of command, and then review by a DoD research office to ensure all the material was suitable for public release. I've been told more than once that no BC or terminal performance information on the M855A1 bullet will be approved for release. The powers that be have also made it clear that test results on products that may be fielded by the DoD in the future are less likely to be approved for release.</p><p></p><p>When I post BC numbers, they are from papers that have already been approved for public release. If we release the BC numbers on additional bullets, it will most likely be as a part of a larger paper that describes our experimental methods and results on a number of bullets as part of a larger work. Bullets that we are testing for possible military use will most likely be tested in multiple rifles and over a range of velocities. Consequently, it is imprudent to post online preliminary test results. Once we have a body of data sufficient for a paper, we usually write a paper and begin the public release approval process. After the paper is approved for public release, we can post data and openly discuss the relevant issues.</p><p></p><p>When bullets are testing below their manufacturer's specifications we also like to perform some additional work to determine why. We've done a lot of work the past few years quantifying the relationships between stability and drag, as well as developing experimental methods to detect whether higher drag than expected is the result of a large tip off angle when exiting the barrel and how quickly the pitch and yaw damp out. We've also done a lot of work over the past few years testing whether or not BCs (or drag coefficients) depend on air density. It turns out all the data Bob McCoy used to establish the independence of drag coefficients on air density was taken at Aberdeen Proving Ground, near sea level. No one had ever empirically tested whether drag coefficients or BCs measured at sea level would give accurate predictions at higher elevations. We may not apply all our tools and techniques to every bullet we test, but if there is sufficient interest, we have some unique tools available.</p></blockquote><p></p>
[QUOTE="Michael Courtney, post: 982877, member: 28191"] See the screenshot of the distribution statement from the last paper. Due to contract obligations, non-disclosure agreements, and DoD rules, most of our research is subject to an approval process prior to publication. The approval process varies a bit over time, but our last BC paper required an internal peer-review by several DoD scientists, approval by my DoD chain of command, and then review by a DoD research office to ensure all the material was suitable for public release. I've been told more than once that no BC or terminal performance information on the M855A1 bullet will be approved for release. The powers that be have also made it clear that test results on products that may be fielded by the DoD in the future are less likely to be approved for release. When I post BC numbers, they are from papers that have already been approved for public release. If we release the BC numbers on additional bullets, it will most likely be as a part of a larger paper that describes our experimental methods and results on a number of bullets as part of a larger work. Bullets that we are testing for possible military use will most likely be tested in multiple rifles and over a range of velocities. Consequently, it is imprudent to post online preliminary test results. Once we have a body of data sufficient for a paper, we usually write a paper and begin the public release approval process. After the paper is approved for public release, we can post data and openly discuss the relevant issues. When bullets are testing below their manufacturer's specifications we also like to perform some additional work to determine why. We've done a lot of work the past few years quantifying the relationships between stability and drag, as well as developing experimental methods to detect whether higher drag than expected is the result of a large tip off angle when exiting the barrel and how quickly the pitch and yaw damp out. We've also done a lot of work over the past few years testing whether or not BCs (or drag coefficients) depend on air density. It turns out all the data Bob McCoy used to establish the independence of drag coefficients on air density was taken at Aberdeen Proving Ground, near sea level. No one had ever empirically tested whether drag coefficients or BCs measured at sea level would give accurate predictions at higher elevations. We may not apply all our tools and techniques to every bullet we test, but if there is sufficient interest, we have some unique tools available. [/QUOTE]
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Berger Bullets Announces Launch of a New Ammo Company
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