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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
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<blockquote data-quote="J E Custom" data-source="post: 1044874" data-attributes="member: 2736"><p>The reason for leveling the action first and then leveling the scope reticle is because the barrel center line and the scope center line are not parallel, they form a triangle and converge at some </p><p>point. If the reticle is not level with the action, as elevation is added horizontal POI will shift</p><p>left or right depending on the error in level and distance.</p><p></p><p>I know match shooters that cant there rifles naturally and when they increase distance they add Windage to compensate for the change.</p><p></p><p>If everything is level there will be almost no Windage change when going from one distance to another other than that caused by the wind.</p><p></p><p>One way to test the reticle is to set up at 200 yards and after zeroing start cranking in elevation</p><p>(4 MOA between shots) aiming at the same point the vertical string will start to move off the vertical line if the scope and scope are not level with each other.</p><p></p><p>So in my opinion, leveling the action and the scope reticle to each other will minimize the error when elevation changes are necessary.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1044874, member: 2736"] The reason for leveling the action first and then leveling the scope reticle is because the barrel center line and the scope center line are not parallel, they form a triangle and converge at some point. If the reticle is not level with the action, as elevation is added horizontal POI will shift left or right depending on the error in level and distance. I know match shooters that cant there rifles naturally and when they increase distance they add Windage to compensate for the change. If everything is level there will be almost no Windage change when going from one distance to another other than that caused by the wind. One way to test the reticle is to set up at 200 yards and after zeroing start cranking in elevation (4 MOA between shots) aiming at the same point the vertical string will start to move off the vertical line if the scope and scope are not level with each other. So in my opinion, leveling the action and the scope reticle to each other will minimize the error when elevation changes are necessary. J E CUSTOM [/QUOTE]
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