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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Nosler LR Accubonds: BC testing results
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<blockquote data-quote="Pdvdh" data-source="post: 966879" data-attributes="member: 4191"><p>Bryan, </p><p></p><p>I'm getting substantially higher Miller SG values with the Berger Bullets calculator, compared to your tested SG values. Here's an example with the LRAB .284 175gr @ 3000 fps MV. 9" twist barrel. Bullet length for this LRAB is 1.510" <u>according to Nosler's web sit</u>e. You're posting a similar "Tested" SG value for the .284 150gr LRAB in a 9" twist barrel. </p><p></p><p>Are your "Tested" SG values being determined using a more accurate method?</p><p></p><p><strong>Berger Bullets Twist Rate Stability Calculator</strong></p><p><img src="http://i712.photobucket.com/albums/ww125/pdhorwath/Nosler284175grMillerSGCalc_zpse9842e81.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>I just measured four of the LRAB .284 175gr bullets and they all measured <strong>1.540</strong>" long. The plastic tip measures <strong>0.140</strong>" long. When I calculate an SG using Patagonia Ballistic's ColdBore 1.0 Twist & Stability calculator, which includes an option for plastic-tipped bullets, I get a Miller SG value of <u>1.70</u>, using all the same input values in the above Berger Bullets calculator solution. </p><p></p><p>If I calculate the SG with ColdBore 1.0 as if the bullet is metal/lead all the way out to the tip and <strong>1.540</strong>" long, I get a Miller SG value of <u>1.42</u>.</p><p></p><p><strong>ColdBore 1.0 Twist & Stability calculator</strong></p><p><img src="http://i712.photobucket.com/albums/ww125/pdhorwath/Nosler284175grMillerSGPlastic-TippedCalc_zpsfd68c465.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Pdvdh, post: 966879, member: 4191"] Bryan, I'm getting substantially higher Miller SG values with the Berger Bullets calculator, compared to your tested SG values. Here's an example with the LRAB .284 175gr @ 3000 fps MV. 9" twist barrel. Bullet length for this LRAB is 1.510" [U]according to Nosler's web sit[/U]e. You're posting a similar "Tested" SG value for the .284 150gr LRAB in a 9" twist barrel. Are your "Tested" SG values being determined using a more accurate method? [B]Berger Bullets Twist Rate Stability Calculator[/B] [IMG]http://i712.photobucket.com/albums/ww125/pdhorwath/Nosler284175grMillerSGCalc_zpse9842e81.jpg[/IMG] I just measured four of the LRAB .284 175gr bullets and they all measured [B]1.540[/B]" long. The plastic tip measures [B]0.140[/B]" long. When I calculate an SG using Patagonia Ballistic's ColdBore 1.0 Twist & Stability calculator, which includes an option for plastic-tipped bullets, I get a Miller SG value of [U]1.70[/U], using all the same input values in the above Berger Bullets calculator solution. If I calculate the SG with ColdBore 1.0 as if the bullet is metal/lead all the way out to the tip and [B]1.540[/B]" long, I get a Miller SG value of [U]1.42[/U]. [B]ColdBore 1.0 Twist & Stability calculator[/B] [IMG]http://i712.photobucket.com/albums/ww125/pdhorwath/Nosler284175grMillerSGPlastic-TippedCalc_zpsfd68c465.jpg[/IMG] [/QUOTE]
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Nosler LR Accubonds: BC testing results
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