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Reticle Perpendicularity by Darrell Holland
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<blockquote data-quote="fj40mojo" data-source="post: 317784" data-attributes="member: 19129"><p>My method for mounting a scope and aligning the reticle is as follows. First I assume that the bottom of the action is perpendicular to the bore. That being said I remove the barreled action from the stock and place it on a level surface with the action supported on a pair of precision ground 1-2-3 blocks and I use a machinist jack set to support the muzzle end of the assembly. With the scope loose in the rings and as close as possible to the location I want it to be for proper eye relief I can rotate the scope within the rings and use a machinist set up square indexed of the same level surface as a verticle reference line. Line the verticle crosshair up with the verticle edge of the square and you are plumb. I've tried putting spirit bubbles on the tops of the reticle caps and on the reticle itself and it's never worked out, at least not to the level of precision that I'm after. I prefer to use machined surfaces to reference off of when trying to maintain parallelism and perpendicularity. All these tools can be purchased from MSC or Enco for less than what you 'd spend on most of the scope leveling gadgets that are on the market.</p></blockquote><p></p>
[QUOTE="fj40mojo, post: 317784, member: 19129"] My method for mounting a scope and aligning the reticle is as follows. First I assume that the bottom of the action is perpendicular to the bore. That being said I remove the barreled action from the stock and place it on a level surface with the action supported on a pair of precision ground 1-2-3 blocks and I use a machinist jack set to support the muzzle end of the assembly. With the scope loose in the rings and as close as possible to the location I want it to be for proper eye relief I can rotate the scope within the rings and use a machinist set up square indexed of the same level surface as a verticle reference line. Line the verticle crosshair up with the verticle edge of the square and you are plumb. I've tried putting spirit bubbles on the tops of the reticle caps and on the reticle itself and it's never worked out, at least not to the level of precision that I'm after. I prefer to use machined surfaces to reference off of when trying to maintain parallelism and perpendicularity. All these tools can be purchased from MSC or Enco for less than what you 'd spend on most of the scope leveling gadgets that are on the market. [/QUOTE]
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Reticle Perpendicularity by Darrell Holland
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