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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="Derfman" data-source="post: 2720736" data-attributes="member: 125828"><p><em>I take measured velocities from Lab radar and compare them to velocities of the same bullet charts of different BCs for the same bullet…I start with the published BC…e.g. G1 = .320, and do charts for .310, .300, etc. until I get a close correlation. I just did one for Powerbelt 270, .50 cal and used the published G1 BC of .312 at 2100 fps; I shot two rounds and my lab radar indicated V0…2097, and 2102, V40=1958 and 1961; V60=1886 and 1889; V80 =1816 and 1819; V90=1781&1781; V100=1746&1747. These velocities were nowhere near the .312 chart, so I printed charts for .300, .290……and finally when I got to .260, V0 =2100, V40=1958;V60=1890, V80=1819; V90=1790; V100=1757. These data correlate closely with the actual measured velocities. Next, I'll shoot at 50, 100, 150, 200, 250 yds and compare the predicted drops from the G1 .260 chart. </em></p></blockquote><p></p>
[QUOTE="Derfman, post: 2720736, member: 125828"] [I]I take measured velocities from Lab radar and compare them to velocities of the same bullet charts of different BCs for the same bullet…I start with the published BC…e.g. G1 = .320, and do charts for .310, .300, etc. until I get a close correlation. I just did one for Powerbelt 270, .50 cal and used the published G1 BC of .312 at 2100 fps; I shot two rounds and my lab radar indicated V0…2097, and 2102, V40=1958 and 1961; V60=1886 and 1889; V80 =1816 and 1819; V90=1781&1781; V100=1746&1747. These velocities were nowhere near the .312 chart, so I printed charts for .300, .290……and finally when I got to .260, V0 =2100, V40=1958;V60=1890, V80=1819; V90=1790; V100=1757. These data correlate closely with the actual measured velocities. Next, I’ll shoot at 50, 100, 150, 200, 250 yds and compare the predicted drops from the G1 .260 chart. [/I] [/QUOTE]
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Calculating BC with LabRadar. It works!
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