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Long Range Hunting & Shooting
spin drift & Coriolis effect
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<blockquote data-quote="RDM416" data-source="post: 490241" data-attributes="member: 3745"><p>Bravo 4, </p><p></p><p>You are exactly right about just the spin drift being way more than 3" at 1000 yards. According to Bryan Litz book, Applied Ballistics for Long Range Shooting, using two different equations for a .308, 168 grain SMK the spin drift alone will be somewhere between 11.1" to 14.24" with a 1:10 twist barrel, a little less with a 1:14 twist. This would be somewhere between 1 to 1 1/2 moa. The spin drift for a 50 BMG using a 750 grain Amax, 1:15 twist barrel is 6.73" as measured by the military using Doppler Radar. (very accurate data). I have verified this with my 510 Allen Mag, using the same bullet but at a higher velocity (the test was a 2690 and I am running 2850 fps) I am seeing 6" right drift at 1000 yards ( a little over 1/2 moa). I use 1/2 moa for my 338 Khan at 1000, the ballistics program I am using gives it 6" value.</p></blockquote><p></p>
[QUOTE="RDM416, post: 490241, member: 3745"] Bravo 4, You are exactly right about just the spin drift being way more than 3" at 1000 yards. According to Bryan Litz book, Applied Ballistics for Long Range Shooting, using two different equations for a .308, 168 grain SMK the spin drift alone will be somewhere between 11.1" to 14.24" with a 1:10 twist barrel, a little less with a 1:14 twist. This would be somewhere between 1 to 1 1/2 moa. The spin drift for a 50 BMG using a 750 grain Amax, 1:15 twist barrel is 6.73" as measured by the military using Doppler Radar. (very accurate data). I have verified this with my 510 Allen Mag, using the same bullet but at a higher velocity (the test was a 2690 and I am running 2850 fps) I am seeing 6" right drift at 1000 yards ( a little over 1/2 moa). I use 1/2 moa for my 338 Khan at 1000, the ballistics program I am using gives it 6" value. [/QUOTE]
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