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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="entoptics" data-source="post: 1438957" data-attributes="member: 104268"><p>I assumed as much too, and strangely, for some of the downrange calculated velocities (i.e. at the distances you set in the software), this is the case, but the V0 velocity is often way off the line for some reason. Of the half dozen shots I calculated, most were over 5-10 fps different from the line projection. In most cases though, the V3/V4 (sometimes even V5) output from the Labrador was within tenths of an FPS from my linear regression calcs.</p><p></p><p>I've attached some graphs that show what I'm talking about. Blue Squares are CSV data, Red Triangles are LabRadar V0-V5 output, and Green square is my calculated V0 velocity using my own regression. </p><p><em></em></p><p><em>It's frankly a bit weird, and perhaps concerning, that the algorithm LabRadar is using isn't internally consistent.</em> <em>Especially considering the linear regression calcs are closer to the expected velocities based on the load data, as well as the more accurate BC calcs returned vs the LabRadar calculated data.</em></p><p></p><p>In the case of a 4 shot string for a 208 ELDM, <em>my calculated velocity was 7 fps slower and had an SD that was 3 FPS lower than what LabRadar calculated for the same string.</em></p><p></p><p><a href="https://lensdump.com/i/8HWm4C" target="_blank"><img src="https://i.lensdump.com/i/8HWm4C.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p><a href="https://lensdump.com/i/8HWpLb" target="_blank"><img src="https://i.lensdump.com/i/8HWpLb.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p><a href="https://lensdump.com/i/8HW4iz" target="_blank"><img src="https://i.lensdump.com/i/8HW4iz.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p><a href="https://lensdump.com/i/8HWKdT" target="_blank"><img src="https://i.lensdump.com/i/8HWKdT.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p></blockquote><p></p>
[QUOTE="entoptics, post: 1438957, member: 104268"] I assumed as much too, and strangely, for some of the downrange calculated velocities (i.e. at the distances you set in the software), this is the case, but the V0 velocity is often way off the line for some reason. Of the half dozen shots I calculated, most were over 5-10 fps different from the line projection. In most cases though, the V3/V4 (sometimes even V5) output from the Labrador was within tenths of an FPS from my linear regression calcs. I've attached some graphs that show what I'm talking about. Blue Squares are CSV data, Red Triangles are LabRadar V0-V5 output, and Green square is my calculated V0 velocity using my own regression. [I] It's frankly a bit weird, and perhaps concerning, that the algorithm LabRadar is using isn't internally consistent.[/I] [I]Especially considering the linear regression calcs are closer to the expected velocities based on the load data, as well as the more accurate BC calcs returned vs the LabRadar calculated data.[/I] In the case of a 4 shot string for a 208 ELDM, [I]my calculated velocity was 7 fps slower and had an SD that was 3 FPS lower than what LabRadar calculated for the same string.[/I] [url=https://lensdump.com/i/8HWm4C][img]https://i.lensdump.com/i/8HWm4C.jpg[/img][/url] [url=https://lensdump.com/i/8HWpLb][img]https://i.lensdump.com/i/8HWpLb.jpg[/img][/url] [url=https://lensdump.com/i/8HW4iz][img]https://i.lensdump.com/i/8HW4iz.jpg[/img][/url] [url=https://lensdump.com/i/8HWKdT][img]https://i.lensdump.com/i/8HWKdT.jpg[/img][/url] [/QUOTE]
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Calculating BC with LabRadar. It works!
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