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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Calculating B.C. with LabRadar. Tutorial on my method.
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<blockquote data-quote="VenatusDominus" data-source="post: 2619208" data-attributes="member: 117869"><p>I do not own a LabRadar but have used a buddies I shoot with. I generally adjust my BC based on POI (the range I shoot at has steel from 100 to 1000 yards). I have used both Applied Ballistics software with my Kestrel 5700 and Hornady's 4DOF software and both give me accurate DOPE. Using LabRadar for MV data and numbers from Hornady's 4DOF program for 100 yard velocity (Hornady 6.5mm 147 ELD-M), I plugged the variables into the JBM Ballistics program and it gave me a G7 BC of .121. </p><p></p><p>This is quite different from Hornady's published G7 of .351 for this bullet. The numbers are: MV 3077, Far Velocity 2949, Chronograph Separation 100, Drag Function G7, Temp 74 F, Pressure 29.11 (non-corrected), Humidity 17.0, Alt 908. Atmospheric data was collected with my Kestrel 5700 and used in both the Hornady 4DOF and JBM Ballistics.</p><p></p><p>I understand Hornady's G7 may be exaggerated (though their 4DOF calculator is spot on with this round) but I can't see it being off by .230.</p></blockquote><p></p>
[QUOTE="VenatusDominus, post: 2619208, member: 117869"] I do not own a LabRadar but have used a buddies I shoot with. I generally adjust my BC based on POI (the range I shoot at has steel from 100 to 1000 yards). I have used both Applied Ballistics software with my Kestrel 5700 and Hornady's 4DOF software and both give me accurate DOPE. Using LabRadar for MV data and numbers from Hornady's 4DOF program for 100 yard velocity (Hornady 6.5mm 147 ELD-M), I plugged the variables into the JBM Ballistics program and it gave me a G7 BC of .121. This is quite different from Hornady's published G7 of .351 for this bullet. The numbers are: MV 3077, Far Velocity 2949, Chronograph Separation 100, Drag Function G7, Temp 74 F, Pressure 29.11 (non-corrected), Humidity 17.0, Alt 908. Atmospheric data was collected with my Kestrel 5700 and used in both the Hornady 4DOF and JBM Ballistics. I understand Hornady's G7 may be exaggerated (though their 4DOF calculator is spot on with this round) but I can't see it being off by .230. [/QUOTE]
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Calculating B.C. with LabRadar. Tutorial on my method.
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