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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Coriolis effect
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<blockquote data-quote="Blaine Fields" data-source="post: 29327" data-attributes="member: 183"><p>The university article was a big help in explaining why the bullet would appear to move right while shooting north. That was the part I was having trouble conceptualizing. So, thanks a lot.</p><p></p><p>As to the usefulness of this calculation, I agree that it is one of the more minor issues to deal with. At 1000 yds, Coriolis effect equals about 1/4 MOA, or around 2.5 inches. Not enough to get worked up about, but given the fact that most of us live north of the equator and most of use right twisting barrels, the two taken together, i.e., Coriolis plus spin drift do add up to a significan number. </p><p></p><p>In another post I was asking for help in coming up with a decent spin drift formula. Using the approximation I have (which I got on this site from S1), at 1000 yds. shooting a 300 WSM, 190 gr. bullet, spin drift plus Coriolis equals around 1 MOA. That is a significant deflection and even if a long range shooter will handle it with a spotting shot (as Darryl suggests) it is still good to know that at range when the POI moves to the right, there is not something wrong with the zero.</p><p></p><p>And, like Dave King says, this is a great beer topic.</p></blockquote><p></p>
[QUOTE="Blaine Fields, post: 29327, member: 183"] The university article was a big help in explaining why the bullet would appear to move right while shooting north. That was the part I was having trouble conceptualizing. So, thanks a lot. As to the usefulness of this calculation, I agree that it is one of the more minor issues to deal with. At 1000 yds, Coriolis effect equals about 1/4 MOA, or around 2.5 inches. Not enough to get worked up about, but given the fact that most of us live north of the equator and most of use right twisting barrels, the two taken together, i.e., Coriolis plus spin drift do add up to a significan number. In another post I was asking for help in coming up with a decent spin drift formula. Using the approximation I have (which I got on this site from S1), at 1000 yds. shooting a 300 WSM, 190 gr. bullet, spin drift plus Coriolis equals around 1 MOA. That is a significant deflection and even if a long range shooter will handle it with a spotting shot (as Darryl suggests) it is still good to know that at range when the POI moves to the right, there is not something wrong with the zero. And, like Dave King says, this is a great beer topic. [/QUOTE]
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Coriolis effect
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