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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Calculating BC with LabRadar. It works!
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<blockquote data-quote="Pdvdh" data-source="post: 1439018" data-attributes="member: 4191"><p>How do you think they get the correct MVs? Most all comparison of MV data I see posted when the LabRadar is run concurrent with a MagnetoSpeed or the Oehler 35P indicates its V0 velocity is accurate.</p><p></p><p>Maybe the algorithm they employ knows more about best fit of the CSV data to an accurate MV than we do?</p><p></p><p>When I calculate bullet BC value from the LabRadar velocities, I'll average the bullet velocities recorded at each programmed distance. Typically V0, V20, V40, V60, and V80yds. If I record 3 bullet velocities, I'll use the average of the 3 velocities at each distance and then model those velocities for BC value using Coldbore 1.0 ballistic software. This helps minimize the error due to any one recorded bullet velocity. I even do this when the loads are at different powder charges, producing differing MVs, during load development. Not a problem because BC is determined from the change in velocity over distance. The differing MVs don't impair the accuracy of the modeled BC value.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1439018, member: 4191"] How do you think they get the correct MVs? Most all comparison of MV data I see posted when the LabRadar is run concurrent with a MagnetoSpeed or the Oehler 35P indicates its V0 velocity is accurate. Maybe the algorithm they employ knows more about best fit of the CSV data to an accurate MV than we do? When I calculate bullet BC value from the LabRadar velocities, I'll average the bullet velocities recorded at each programmed distance. Typically V0, V20, V40, V60, and V80yds. If I record 3 bullet velocities, I'll use the average of the 3 velocities at each distance and then model those velocities for BC value using Coldbore 1.0 ballistic software. This helps minimize the error due to any one recorded bullet velocity. I even do this when the loads are at different powder charges, producing differing MVs, during load development. Not a problem because BC is determined from the change in velocity over distance. The differing MVs don't impair the accuracy of the modeled BC value. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Calculating BC with LabRadar. It works!
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