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Long Range Hunting & Shooting
Drastic BC change from 800 t0 900 yds??
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<blockquote data-quote="BryanLitz" data-source="post: 321159" data-attributes="member: 7848"><p>I got a chance to test the 140 VLD's this past weekend from my .260 Rem. Here are the details:</p><p></p><p>49.2F, 28.48 inHg, 74% RH</p><p>1:8.5" twist, 30" long bartlein barrel</p><p>6.5mm 140 VLD's, G7 BC = 0.313</p><p>Ave MV: 2893 fps</p><p>sight height: 2.27"</p><p>POI at 95 yards: +26.75" (average vertical POI of 5 shots)</p><p>POI at 1001 yards: +5.63" (average vertical POI of 5 shots)</p><p>Predicted POI at 1001 yards: +8.16"</p><p><strong>Error in 1001 yard POI: -2.53".</strong></p><p>*note that the error budget in this experimental set up is about +/- 2.3" in 1001 yard POI based on the measurement uncertainties involved.</p><p></p><p>The groups (both 95 yards and 1001 yards) were 5 shots each, and were ~1/2 MOA in size.</p><p></p><p>I also fired 5 shot groups at 600, 800, and 900 yards. All of them impacted within 1/2 MOA of predicted elevation.</p><p></p><p>So I was unable to reproduce the result we've been discussing in this thread. I'm not discounting that there may be something weird going on with other combination, just sharing that in my test, the bullet behaved exactly as predicted according to the G7 BC all the way to 1000 yards.</p><p></p><p>Has anyone else had a chance to test this bullet any further?</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 321159, member: 7848"] I got a chance to test the 140 VLD's this past weekend from my .260 Rem. Here are the details: 49.2F, 28.48 inHg, 74% RH 1:8.5" twist, 30" long bartlein barrel 6.5mm 140 VLD's, G7 BC = 0.313 Ave MV: 2893 fps sight height: 2.27" POI at 95 yards: +26.75" (average vertical POI of 5 shots) POI at 1001 yards: +5.63" (average vertical POI of 5 shots) Predicted POI at 1001 yards: +8.16" [B]Error in 1001 yard POI: -2.53".[/B] *note that the error budget in this experimental set up is about +/- 2.3" in 1001 yard POI based on the measurement uncertainties involved. The groups (both 95 yards and 1001 yards) were 5 shots each, and were ~1/2 MOA in size. I also fired 5 shot groups at 600, 800, and 900 yards. All of them impacted within 1/2 MOA of predicted elevation. So I was unable to reproduce the result we've been discussing in this thread. I'm not discounting that there may be something weird going on with other combination, just sharing that in my test, the bullet behaved exactly as predicted according to the G7 BC all the way to 1000 yards. Has anyone else had a chance to test this bullet any further? -Bryan [/QUOTE]
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Drastic BC change from 800 t0 900 yds??
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