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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: 408665" data-attributes="member: 4191"><p>Dang! You guys may doubt my honesty if I post these results. These kind of chronograph data make me smile every time I read posts on the Forum about how unreliable chronograph velocity data are. To the point that some believe their measured downrange drops are a more accurate reflection of downrange velocity and bullet BC than a BC determined from chronograph velocities. </p><p></p><p>Anyhow - I worked up a slightly faster load that shot quite well at 295yds last weekend. Good enough that I decided I'll use the 300WM with this load for sheep hunting next month. I'm going to print out some drop charts for 10°, 20°, and 30° inclined shots. Before completing those charts I wanted to record my downrange velocities and confirm again the Berger G7 BC value was on the money. </p><p></p><p>You know the skinny by now. Here's the pertinent data, in case you LB3.0 owners/users want to ensure there's no operator error.</p><p></p><p>300 Win Mag with 25.5" Lilja 1:10 twist barrel</p><p>Berger .308 210gr VLD</p><p>G7 BC=.323</p><p>MV = 2938 fps (average of 5 shots)</p><p>Environmental Conditions: 29.75 in/Hg, 67°F, 61%RH</p><p>Default Drag Coefficient set at 0.500</p><p>LB3.0 <u>predicted</u> 983yd velocity = <u><strong>1674 fps</strong></u></p><p></p><p><u>Chronographed</u> 983yd velocity = <u><strong>1674 fps</strong></u> (average of two shots with ES of 22 fps). </p><p></p><p>My target was set up at 985 yds. The middle of the skyscreens were two yards closer. So 983 yds. </p><p></p><p>With Latitude = 60.4° and Azimuth = 90°, and Coriolis and Spin Drift turned on, the average of these two bullet impacts on target was 2" higher than the LB3.0 predicted point of impact. I'm not worried about that. No way to know the source of 2" at 1000yds, and I can't be confident that I'm any better than 2" at that range. I mostly wanted to confirm my G7 BC value was on the money. And it doesn't get any better than this!</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 408665, member: 4191"] Dang! You guys may doubt my honesty if I post these results. These kind of chronograph data make me smile every time I read posts on the Forum about how unreliable chronograph velocity data are. To the point that some believe their measured downrange drops are a more accurate reflection of downrange velocity and bullet BC than a BC determined from chronograph velocities. Anyhow - I worked up a slightly faster load that shot quite well at 295yds last weekend. Good enough that I decided I'll use the 300WM with this load for sheep hunting next month. I'm going to print out some drop charts for 10°, 20°, and 30° inclined shots. Before completing those charts I wanted to record my downrange velocities and confirm again the Berger G7 BC value was on the money. You know the skinny by now. Here's the pertinent data, in case you LB3.0 owners/users want to ensure there's no operator error. 300 Win Mag with 25.5" Lilja 1:10 twist barrel Berger .308 210gr VLD G7 BC=.323 MV = 2938 fps (average of 5 shots) Environmental Conditions: 29.75 in/Hg, 67°F, 61%RH Default Drag Coefficient set at 0.500 LB3.0 [U]predicted[/U] 983yd velocity = [U][B]1674 fps[/B][/U] [U]Chronographed[/U] 983yd velocity = [U][B]1674 fps[/B][/U] (average of two shots with ES of 22 fps). My target was set up at 985 yds. The middle of the skyscreens were two yards closer. So 983 yds. With Latitude = 60.4° and Azimuth = 90°, and Coriolis and Spin Drift turned on, the average of these two bullet impacts on target was 2" higher than the LB3.0 predicted point of impact. I’m not worried about that. No way to know the source of 2” at 1000yds, and I can’t be confident that I’m any better than 2” at that range. I mostly wanted to confirm my G7 BC value was on the money. And it doesn’t get any better than this! [/QUOTE]
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LoadBase 3.0 Mobile w/G7 BC Test Results
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