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Reticle Perpendicularity by Darrell Holland
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<blockquote data-quote="Matthew Courtney" data-source="post: 1310919" data-attributes="member: 101396"><p>Even a reticle that is canted 45 degrees is as perpendicular to the bore as any other. The entire sight plane is roughly perpendicular to the bore on a correctly mounted scope, without regard to the reticle's position on the sight plane. The horizontal axis of the reticle needs to be level when the rifle is in the shooting position.</p><p></p><p> The explanation of the Coriolis effect is incorrect as well as only points on the equator move rotate at that speed. The author leaves out the rest of the globe where rotational speed on the earths surface decrease as points near the poles. The main impact of the Coriolis effect derives from the truth that points at differing distances from the equator are moving at different speeds, thus unless the shooter and target are at precisely the same latitude, one must account for the differing relative speeds of the shooter and the target.</p><p></p><p>At least the solution described addresses a common issue, incongruent rifle/scope cant, albeit not the issue that the writer described.</p></blockquote><p></p>
[QUOTE="Matthew Courtney, post: 1310919, member: 101396"] Even a reticle that is canted 45 degrees is as perpendicular to the bore as any other. The entire sight plane is roughly perpendicular to the bore on a correctly mounted scope, without regard to the reticle's position on the sight plane. The horizontal axis of the reticle needs to be level when the rifle is in the shooting position. The explanation of the Coriolis effect is incorrect as well as only points on the equator move rotate at that speed. The author leaves out the rest of the globe where rotational speed on the earths surface decrease as points near the poles. The main impact of the Coriolis effect derives from the truth that points at differing distances from the equator are moving at different speeds, thus unless the shooter and target are at precisely the same latitude, one must account for the differing relative speeds of the shooter and the target. At least the solution described addresses a common issue, incongruent rifle/scope cant, albeit not the issue that the writer described. [/QUOTE]
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