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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Scope Levels- Why?
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<blockquote data-quote="An Idahoan" data-source="post: 1891673" data-attributes="member: 95631"><p>I used to be convinced that bore, optical axis, and reticle all had to be "in line" on mathematical/geometric grounds. I insisted despite my mechanical engineering brother telling me I was wrong. I should have listened to him. But then I finally figured it out for myself. Those whose natural point of aim involves holding the rifle at anything other than 12 o' clock can rest easy. I am one such person. </p><p></p><p>The fine print is that for those who cant the stock more than a small amount should calculate the horizontal distance between the bore and the optical axis. For example, a 2" vertical separation and a 15° left stock cant (which is a lot) will give you a 0.53" horizontal distance between the two axes. Ideally, your windage zero would be at an infinite distance, but that isn't realistic for several reasons. You can perform a windage zero at 100 yards and adjust windage so that you're right by 0.53". This way, you'll be off 0.53" at all distances, which is acceptable to 99.9% of us on this forum. If you don't offset your windage, then (assuming your reticle is still plumb) you'll be dead on at 100 yards, and left 0.53" at 200 yards, left 1.06" at 300 yards, 1.59" at 400 yards and so on.</p></blockquote><p></p>
[QUOTE="An Idahoan, post: 1891673, member: 95631"] I used to be convinced that bore, optical axis, and reticle all had to be "in line" on mathematical/geometric grounds. I insisted despite my mechanical engineering brother telling me I was wrong. I should have listened to him. But then I finally figured it out for myself. Those whose natural point of aim involves holding the rifle at anything other than 12 o' clock can rest easy. I am one such person. The fine print is that for those who cant the stock more than a small amount should calculate the horizontal distance between the bore and the optical axis. For example, a 2" vertical separation and a 15° left stock cant (which is a lot) will give you a 0.53" horizontal distance between the two axes. Ideally, your windage zero would be at an infinite distance, but that isn't realistic for several reasons. You can perform a windage zero at 100 yards and adjust windage so that you're right by 0.53". This way, you'll be off 0.53" at all distances, which is acceptable to 99.9% of us on this forum. If you don't offset your windage, then (assuming your reticle is still plumb) you'll be dead on at 100 yards, and left 0.53" at 200 yards, left 1.06" at 300 yards, 1.59" at 400 yards and so on. [/QUOTE]
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Rifles, Bullets, Barrels & Ballistics
Scope Levels- Why?
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