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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Do you guys dial in for spin drift?
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<blockquote data-quote="Bart B" data-source="post: 502940" data-attributes="member: 5302"><p>Col. Hatcher wrote in his notebook that the .30-06 drifted about 1/3 MOA at 1350 yards. So at 1000 yards, the spin drift's only about 1/4th MOA.</p><p></p><p>I and other long range shooters with high master classifications competing in long range matches use the same windage zero from 100 through 1000 yards. Considering the bullet's trajecory axis changes only about 1.5 degrees from up at the muzzle to down at a 1000-yard target, there's not enough gyroscopic precession working on the bullet over time to drift it very much.</p><p></p><p>So there's not enough to even measure easily by live firing exercises. How Col. Hatcher got his data is unknown to me.</p></blockquote><p></p>
[QUOTE="Bart B, post: 502940, member: 5302"] Col. Hatcher wrote in his notebook that the .30-06 drifted about 1/3 MOA at 1350 yards. So at 1000 yards, the spin drift's only about 1/4th MOA. I and other long range shooters with high master classifications competing in long range matches use the same windage zero from 100 through 1000 yards. Considering the bullet's trajecory axis changes only about 1.5 degrees from up at the muzzle to down at a 1000-yard target, there's not enough gyroscopic precession working on the bullet over time to drift it very much. So there's not enough to even measure easily by live firing exercises. How Col. Hatcher got his data is unknown to me. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Do you guys dial in for spin drift?
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