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Long Range Hunting & Shooting
extreme spin drift
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<blockquote data-quote="Pdvdh" data-source="post: 1123683" data-attributes="member: 4191"><p><strong>Re: Excessive Rightward Drift</strong></p><p></p><p>I once experienced excessive rightward drift with one rifle, compared to a similar rifle in side by side tests shooting at 1000yds. </p><p></p><p>After examining everything closely, I saw that the scope rail alignment on one of the rifles was left or right of the barrel alignment (can't recall which way now). I corrected the crooked scope rail and got it running parallel to the barrel by running a straight edge along the side of the rail and checking the alignment at the muzzle off of both sides of the one-piece scope rail.</p><p></p><p>That corrected my problem. I never understood the physics involved in creating the excessive left to right drift. But after I mounted the scope rail parallel to the barrel, the rightward drift downrange was the same as my other rifle, and matched the predicted rightward drift, accounting for both spin drift and coriolis drift. </p><p></p><p>Now when I mount a scope rail, I always check it with a straight edge which extends all the way down to the muzzle. My scope rail was off far enough that I initially identified it visually, just looking down on the scope from the top. So it was off quite a bit.</p><p></p><p>But there are a number of additional sources that can cause this, which others have identified.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1123683, member: 4191"] [b]Re: Excessive Rightward Drift[/b] I once experienced excessive rightward drift with one rifle, compared to a similar rifle in side by side tests shooting at 1000yds. After examining everything closely, I saw that the scope rail alignment on one of the rifles was left or right of the barrel alignment (can't recall which way now). I corrected the crooked scope rail and got it running parallel to the barrel by running a straight edge along the side of the rail and checking the alignment at the muzzle off of both sides of the one-piece scope rail. That corrected my problem. I never understood the physics involved in creating the excessive left to right drift. But after I mounted the scope rail parallel to the barrel, the rightward drift downrange was the same as my other rifle, and matched the predicted rightward drift, accounting for both spin drift and coriolis drift. Now when I mount a scope rail, I always check it with a straight edge which extends all the way down to the muzzle. My scope rail was off far enough that I initially identified it visually, just looking down on the scope from the top. So it was off quite a bit. But there are a number of additional sources that can cause this, which others have identified. [/QUOTE]
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