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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hammer ballistic coefficient tests...
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<blockquote data-quote="Hugnot" data-source="post: 2613170" data-attributes="member: 115658"><p>The Sg's look real good for the bullets shown.</p><p></p><p>I ran these using a slower velocity than the big .264 WM, like would be expected from a 6.5 Creedmoor having an 8 twist. Sg's should be slightly higher with the big speedy .264 WM.</p><p></p><p>[ATTACH]392275[/ATTACH]</p><p></p><p>I also checked my numbers against JBM using the 147 Hornady ELDM, not have an actual bullet to measure I used JBM data.</p><p></p><p>[ATTACH]392273[/ATTACH]</p><p></p><p>Any info how JBM does BC calcs using velocity differences? The bullets tested should be flying real good with minimum wobbling. The Hornady 4DOF uses drag coefficients vs. comparisons to some standard bullet. BC's change during bullet flight. I would like to see the JBM method.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2613170, member: 115658"] The Sg's look real good for the bullets shown. I ran these using a slower velocity than the big .264 WM, like would be expected from a 6.5 Creedmoor having an 8 twist. Sg's should be slightly higher with the big speedy .264 WM. [ATTACH alt="Screenshot (432).png"]392275[/ATTACH] I also checked my numbers against JBM using the 147 Hornady ELDM, not have an actual bullet to measure I used JBM data. [ATTACH alt="Screenshot (430).png"]392273[/ATTACH] Any info how JBM does BC calcs using velocity differences? The bullets tested should be flying real good with minimum wobbling. The Hornady 4DOF uses drag coefficients vs. comparisons to some standard bullet. BC's change during bullet flight. I would like to see the JBM method. [/QUOTE]
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Hammer ballistic coefficient tests...
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