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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Objective way to level crosshair
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<blockquote data-quote="Dave King" data-source="post: 19312" data-attributes="member: 3"><p>Use a plumb bob on a large distant backer (200 yards should do) to establish true vertical. Establish three aiming points along the previously established true vertical line, the distance between these aimpoint should be as large as possible (limited by the elevation available internal to the scope mechanism). Using your 200 yard zero (assume the backer is at 200 yards) fire onto the center point of aim, then adjust the scope up about 12 MOA or more (24" at 200 yards) and fire another group onto the backer using the upper previously extablisted point of aim, lastly adjust the scope to 12 MOA below the inital group and shoot again. Plot the center(s) of these groups, if they aren't tracking plumb you'll need to adjust the scope/rifle combination to establish true vertical.</p><p></p><p>You may find that the reticle is not installed exactly parallel with the elevation mechanism, I could imagine a few degrees of allowable error.</p><p></p><p>I suppose a person could check for mis-alignment between the mechanism(s) and the reticle by capturing the scope or rifle/scope combination in a vise and tracking the apparent movement of the reticle against a distance plumb line. Set the reticle vertical line to match the plumb line then adjust the elevation mechanism from top to bottom and watch to see if it diverges from true plumb/vertical.</p><p></p><p></p><p>Something I have not tried yet. Set the rifle on a bench and place the center of the muzzle directly against a plumb line which extends downward from a support far above the bench. Viewing through the scope this plumb line will probably be nearly invisible and somewhat useless BUT if a mirror were place at a considerable distance from the rifle and the observer used the reflection of the rifle and plumb line in the mirror to check plumb it may be possible to see if the rifle/scope combination is canted. Far fetched but something I may try some day.</p></blockquote><p></p>
[QUOTE="Dave King, post: 19312, member: 3"] Use a plumb bob on a large distant backer (200 yards should do) to establish true vertical. Establish three aiming points along the previously established true vertical line, the distance between these aimpoint should be as large as possible (limited by the elevation available internal to the scope mechanism). Using your 200 yard zero (assume the backer is at 200 yards) fire onto the center point of aim, then adjust the scope up about 12 MOA or more (24" at 200 yards) and fire another group onto the backer using the upper previously extablisted point of aim, lastly adjust the scope to 12 MOA below the inital group and shoot again. Plot the center(s) of these groups, if they aren't tracking plumb you'll need to adjust the scope/rifle combination to establish true vertical. You may find that the reticle is not installed exactly parallel with the elevation mechanism, I could imagine a few degrees of allowable error. I suppose a person could check for mis-alignment between the mechanism(s) and the reticle by capturing the scope or rifle/scope combination in a vise and tracking the apparent movement of the reticle against a distance plumb line. Set the reticle vertical line to match the plumb line then adjust the elevation mechanism from top to bottom and watch to see if it diverges from true plumb/vertical. Something I have not tried yet. Set the rifle on a bench and place the center of the muzzle directly against a plumb line which extends downward from a support far above the bench. Viewing through the scope this plumb line will probably be nearly invisible and somewhat useless BUT if a mirror were place at a considerable distance from the rifle and the observer used the reflection of the rifle and plumb line in the mirror to check plumb it may be possible to see if the rifle/scope combination is canted. Far fetched but something I may try some day. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Objective way to level crosshair
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