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<blockquote data-quote="PrairieGhost" data-source="post: 130353" data-attributes="member: 704">I see a big flaw in that thing, but don't know if I can explain it.&nbsp; First you have to determine you have a level rifle.&nbsp; That doesn't do it.&nbsp; My big question is how do you know the devise is level.&nbsp; Your rifle could be canted, and your reticle still aligned to fit in that window on the devise.&nbsp; This has got me thinking though.&nbsp; The reticle must be perfectly aligned at 90 degrees to center of bore.&nbsp; I wonder if a person could use bright thin thread suspended with a weight to act like a plumb line.&nbsp; Then center the plumb line on your bore, and align your reticle to the plumb line.&nbsp; On a bolt action you could pull the bolt and sight through the bore on a plumb line some distance away then center your reticle by turning your scope to align, and adjusting the turret to bring it to center.&nbsp; You would then be level and bore sighted to the vertical plane.</blockquote>

[QUOTE="PrairieGhost, post: 130353, member: 704"] I see a big flaw in that thing, but don't know if I can explain it. First you have to determine you have a level rifle. That doesn't do it. My big question is how do you know the devise is level. Your rifle could be canted, and your reticle still aligned to fit in that window on the devise. This has got me thinking though. The reticle must be perfectly aligned at 90 degrees to center of bore. I wonder if a person could use bright thin thread suspended with a weight to act like a plumb line. Then center the plumb line on your bore, and align your reticle to the plumb line. On a bolt action you could pull the bolt and sight through the bore on a plumb line some distance away then center your reticle by turning your scope to align, and adjusting the turret to bring it to center. You would then be level and bore sighted to the vertical plane. [/QUOTE]

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