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Long Range Hunting & Shooting
spin drift & Coriolis effect
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<blockquote data-quote="paphil" data-source="post: 492250" data-attributes="member: 17745"><p>I've read this entire thread and am more confused than before I started. First , Corioles has nothing to do with spin drift. It is all about the rotation of the earth and is a very small factor in 1000 yard shooting It is dependant on time of flight and direction. North and south have no effect and east will be high poi and west will have low poi. How much depends on distance and time of flight.</p><p>Spin drift is caused by the effect of gravity on the moving ,spinning bullet . when you apply a force to a gyroscope it tends to move at right angle to the force applied. On a bullet spinning right and gravity pulling down, the drift is to the right. The opposite for a left spin. </p><p>When you have a wind blowing from the left , the gyroscopic force will make the bullet go right and down. Conversely a wind from the right will make the bullet go left and up. I know many will argue this but real world experience tells me that i should listen to my college physics lessons and the results I have shooting long range cold bore shots. The drift is about 3 1/2 minutes to 1 . You don't get spotter shots on game. Try it next time you shoot in the wind. </p><p> </p><p>Next time you shoot a spotter shot in the wind, , pay attention where it hits. Wind from the left, hit will be low. Wind from the right, the hit will be high!</p><p> </p><p>Found a really good old thread with some actual testing. Vertical Component of Wind Drift</p></blockquote><p></p>
[QUOTE="paphil, post: 492250, member: 17745"] I've read this entire thread and am more confused than before I started. First , Corioles has nothing to do with spin drift. It is all about the rotation of the earth and is a very small factor in 1000 yard shooting It is dependant on time of flight and direction. North and south have no effect and east will be high poi and west will have low poi. How much depends on distance and time of flight. Spin drift is caused by the effect of gravity on the moving ,spinning bullet . when you apply a force to a gyroscope it tends to move at right angle to the force applied. On a bullet spinning right and gravity pulling down, the drift is to the right. The opposite for a left spin. When you have a wind blowing from the left , the gyroscopic force will make the bullet go right and down. Conversely a wind from the right will make the bullet go left and up. I know many will argue this but real world experience tells me that i should listen to my college physics lessons and the results I have shooting long range cold bore shots. The drift is about 3 1/2 minutes to 1 . You don't get spotter shots on game. Try it next time you shoot in the wind. Next time you shoot a spotter shot in the wind, , pay attention where it hits. Wind from the left, hit will be low. Wind from the right, the hit will be high! Found a really good old thread with some actual testing. Vertical Component of Wind Drift [/QUOTE]
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