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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: 1438858" data-attributes="member: 4191"><p>I've also back calculated bullet BC values. The more bullets fired the more confidence I have in the calculated BC values.</p><p>I've also observed the "noise" in the CSV files. So I have more confidence using the velocities from some additional shots fired @ 0-20-40-60-80yds. I don't mess with the CSV files anymore. I presume the LabRadar engineers have already applied a good mathematical fit from the CSV data which helps focus thru the background noise and yields best fit velocity values at the pre-programmed distances.</p><p>We all know there is some decay (lowering) of BC value as bullets slow down in flight over long distances. So the BC values I've calculated are considered good values for closer ranges, like out to 400yds. I have not tested them by collecting down range velocity at 800yds-1000yds. Nor have I drop tested the <em>LR</em> based BC values by measuring drops on target at Long yardage. For those wondering how I collect bullet velocity @ 1000yds - suffice to say it is not with the LR. I use a triplicate optical chronograph setup.</p><p></p><p>I find the <em>LR</em> particularly valuable for generating BC values for custom bullets which have not been BC verified by the manufacturer with Doppler radar or some equivalent velocity measuring equipment.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1438858, member: 4191"] I've also back calculated bullet BC values. The more bullets fired the more confidence I have in the calculated BC values. I've also observed the "noise" in the CSV files. So I have more confidence using the velocities from some additional shots fired @ 0-20-40-60-80yds. I don't mess with the CSV files anymore. I presume the LabRadar engineers have already applied a good mathematical fit from the CSV data which helps focus thru the background noise and yields best fit velocity values at the pre-programmed distances. We all know there is some decay (lowering) of BC value as bullets slow down in flight over long distances. So the BC values I've calculated are considered good values for closer ranges, like out to 400yds. I have not tested them by collecting down range velocity at 800yds-1000yds. Nor have I drop tested the [I]LR[/I] based BC values by measuring drops on target at Long yardage. For those wondering how I collect bullet velocity @ 1000yds - suffice to say it is not with the LR. I use a triplicate optical chronograph setup. I find the [I]LR[/I] particularly valuable for generating BC values for custom bullets which have not been BC verified by the manufacturer with Doppler radar or some equivalent velocity measuring equipment. [/QUOTE]
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Calculating BC with LabRadar. It works!
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