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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
spin drift
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<blockquote data-quote="Augustus" data-source="post: 190743" data-attributes="member: 10142"><p>Mike, I did address two different things in the post, one was spin drift and the other was the effects of the rotation of the earth, spin drift seems to be around 1 moa at 1000 with the ones I shoot. At 1000 the effects of the earths rotation is around 2.5 inches. It will be added to the effects of spin drift when shooting South and taken away when shooting North. This is so small that it can rarely be seen due to being masked by other factors such as wind and errors in hold. On the subject of canted reticles. I certianly would not want to get in an argument but I think when you get a hold-over reticle verticle it will obviously stay that way as you raise it for come-ups. When you plumb a reticle there is no gaurantee that the intersection of the crosshairs are going to track perfectly up and down the plumb line. Since I have never been a clicker I have never taken a scope with an internal cant problem and tested it. I think what will happen is that after plumbing it on a plumbline and you begin to click vertically you will see the intersection start to drift off the line one way or the other and it will get progressively worse the further you go. Someone who knows from experience may want to kick in here as I would be interested in what they have to say.</p></blockquote><p></p>
[QUOTE="Augustus, post: 190743, member: 10142"] Mike, I did address two different things in the post, one was spin drift and the other was the effects of the rotation of the earth, spin drift seems to be around 1 moa at 1000 with the ones I shoot. At 1000 the effects of the earths rotation is around 2.5 inches. It will be added to the effects of spin drift when shooting South and taken away when shooting North. This is so small that it can rarely be seen due to being masked by other factors such as wind and errors in hold. On the subject of canted reticles. I certianly would not want to get in an argument but I think when you get a hold-over reticle verticle it will obviously stay that way as you raise it for come-ups. When you plumb a reticle there is no gaurantee that the intersection of the crosshairs are going to track perfectly up and down the plumb line. Since I have never been a clicker I have never taken a scope with an internal cant problem and tested it. I think what will happen is that after plumbing it on a plumbline and you begin to click vertically you will see the intersection start to drift off the line one way or the other and it will get progressively worse the further you go. Someone who knows from experience may want to kick in here as I would be interested in what they have to say. [/QUOTE]
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spin drift
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