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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
spin drift
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<blockquote data-quote="Pdvdh" data-source="post: 250160" data-attributes="member: 4191"><p>I didnt realize I could calculate SFs with Loadbase 2.0 until I read Eaglet's post. So I calculated SFs of 1.44 (7mm) and 1.69 (308) for my conditions of fire.</p><p></p><p>With these SFs I calculated 4.9" spindrift for the 168 gr VLD (7mm Rem Mag) and 6.5" spindrift for the 210 gr VLD (300 Win Mag).</p><p></p><p>My actual spindrift was about 9" with the 168 gr VLD and 7" with the 210 VLD.</p><p></p><p>So I'm pretty darn close to your formula's prediction with the 210 VLD, but I experienced about 80% more spindrift with the 168 VLD.</p><p></p><p>I would note that Loadbase 2.0 calculated 4.48" Coriolis drift at 1000 yds for my 168gr VLD, and 4.74" Coriolis drift for my 210 VLD. I subtracted these from my total drift in order to calculate spindrift from my measured POIs.</p><p></p><p>You're correct that there are a number of factors that could explain the discrepancy with my 7mm Rem Mag, and I'm not going to lose any sleep over it. I've determined my drift by field measurement and that's what I'm running with. <strong>Thanks Michael, and Eaglet too</strong>, for pointing out that SF can be calculated with LoadBase 2.0.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 250160, member: 4191"] I didnt realize I could calculate SFs with Loadbase 2.0 until I read Eaglet's post. So I calculated SFs of 1.44 (7mm) and 1.69 (308) for my conditions of fire. With these SFs I calculated 4.9" spindrift for the 168 gr VLD (7mm Rem Mag) and 6.5" spindrift for the 210 gr VLD (300 Win Mag). My actual spindrift was about 9" with the 168 gr VLD and 7" with the 210 VLD. So I'm pretty darn close to your formula's prediction with the 210 VLD, but I experienced about 80% more spindrift with the 168 VLD. I would note that Loadbase 2.0 calculated 4.48" Coriolis drift at 1000 yds for my 168gr VLD, and 4.74" Coriolis drift for my 210 VLD. I subtracted these from my total drift in order to calculate spindrift from my measured POIs. You're correct that there are a number of factors that could explain the discrepancy with my 7mm Rem Mag, and I'm not going to lose any sleep over it. I've determined my drift by field measurement and that's what I'm running with. [B]Thanks Michael, and Eaglet too[/B], for pointing out that SF can be calculated with LoadBase 2.0. [/QUOTE]
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