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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
LoadBase 3.0 Mobile w/G7 BC Test Results
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<blockquote data-quote="Pdvdh" data-source="post: 387274" data-attributes="member: 4191"><p>Bryan,</p><p>I made a boo-boo with the transcription of my recorded velocities, <strong>which has now been corrected</strong> in my original 5/2/10 Post on the 162 gr A-MAX data. Everything else was correct. Please review the Post (as updated 5/3/10) so you receive the correct conclusion. Sorry for this mistake and confusion.</p><p></p><p>Explanation for required correction: Only 1 chronograph recorded these two velocities, and not the one that was used to establish the muzzle velocity. So I was supposed to reduce my measured velocity from the PACT chronograph by ~10 fps because that's the difference in velocity I record at this distance between these two chronos (PACT & Oehler). I had increased the measured velocity 10 fps by mistake. </p><p></p><p>Now the measured 985yd velocities are adjusted properly, and <u>the measured 985 yd velocity is 8.8 fps less than the predicted velocity</u>. My tweak to obtain a predicted velocity matching the measured 985 yd velocity is to <em>reduce</em> your G7 BC from 0.307 down to 0.305. </p><p></p><p>I know I'm splitting hairs at this point. My measured velocities could off +/-5 fps, just based on the accuracy limitations of the chronographs. My laser-measured distance could be off +/- a couple yards also. I'm doing about the best I can do to obtain data about as good as my equipment is capable - but I recognize that there are inherent limitations with the equipment. <em>And my brain </em>- when I shift measured velocity in the wrong direction!</p><p></p><p>But I'm concluding I can run your G7 BCs with the default LoadBase 3.0 drag coefficient of 0.500 and have very high confidence that my predicted dope will be very close to dead nutz on the money.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 387274, member: 4191"] Bryan, I made a boo-boo with the transcription of my recorded velocities, [B]which has now been corrected[/B] in my original 5/2/10 Post on the 162 gr A-MAX data. Everything else was correct. Please review the Post (as updated 5/3/10) so you receive the correct conclusion. Sorry for this mistake and confusion. Explanation for required correction: Only 1 chronograph recorded these two velocities, and not the one that was used to establish the muzzle velocity. So I was supposed to reduce my measured velocity from the PACT chronograph by ~10 fps because that's the difference in velocity I record at this distance between these two chronos (PACT & Oehler). I had increased the measured velocity 10 fps by mistake. Now the measured 985yd velocities are adjusted properly, and [U]the measured 985 yd velocity is 8.8 fps less than the predicted velocity[/U]. My tweak to obtain a predicted velocity matching the measured 985 yd velocity is to [I]reduce[/I] your G7 BC from 0.307 down to 0.305. I know I'm splitting hairs at this point. My measured velocities could off +/-5 fps, just based on the accuracy limitations of the chronographs. My laser-measured distance could be off +/- a couple yards also. I'm doing about the best I can do to obtain data about as good as my equipment is capable - but I recognize that there are inherent limitations with the equipment. [I]And my brain [/I]- when I shift measured velocity in the wrong direction! But I'm concluding I can run your G7 BCs with the default LoadBase 3.0 drag coefficient of 0.500 and have very high confidence that my predicted dope will be very close to dead nutz on the money. [/QUOTE]
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LoadBase 3.0 Mobile w/G7 BC Test Results
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