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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Scope Not Level With My Action
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<blockquote data-quote="gilk1" data-source="post: 1700395" data-attributes="member: 38214"><p>Putting a level on your turret or action is pointless. Align your reticle with the centerline of the action by eye - you will be within 1-2deg. Tighten it down and don't bother it. Now you place a permanent scope/reticle level on your scope and shoot a tall target test at a range measured very precisely with a steel tape. This allows you to plumb the reticle and measure your scope turret error in one setting. It is infinitely more important that the reticle is plum with gravity than aligned to the bore axis. I'll prove it (see attached diagram):</p><p></p><p>Scenario 1: Your scope is 10deg canted to the bore axis but is plumb. The horizontal poi shift due to that cant [USER=7444]@1000YDS[/USER] (expressed as x & h is scope height) is</p><p>x=htan(theta)=2.5"tan(10deg)=0.44"</p><p> And this is true at all ranges.</p><p></p><p>Scenario 2: Your reticle is aligned to the bore but is canted 1deg to true plumb.The horizontal poi shift due to that cant [USER=7444]@1000YDS[/USER] (expressed as x & h is scope adjustment of 30moa) is</p><p>x=hsin(theta)=314.1"sin(1deg)=5.48". And this doesn't include the vertical poi shift.</p><p></p><p>So you see the cant of a reticle to the bore is inconsequential and the cant of the reticle to gravity is critical at extended ranges (124.5 times more critical).</p></blockquote><p></p>
[QUOTE="gilk1, post: 1700395, member: 38214"] Putting a level on your turret or action is pointless. Align your reticle with the centerline of the action by eye - you will be within 1-2deg. Tighten it down and don’t bother it. Now you place a permanent scope/reticle level on your scope and shoot a tall target test at a range measured very precisely with a steel tape. This allows you to plumb the reticle and measure your scope turret error in one setting. It is infinitely more important that the reticle is plum with gravity than aligned to the bore axis. I’ll prove it (see attached diagram): Scenario 1: Your scope is 10deg canted to the bore axis but is plumb. The horizontal poi shift due to that cant [USER=7444]@1000YDS[/USER] (expressed as x & h is scope height) is x=htan(theta)=2.5”tan(10deg)=0.44” And this is true at all ranges. Scenario 2: Your reticle is aligned to the bore but is canted 1deg to true plumb.The horizontal poi shift due to that cant [USER=7444]@1000YDS[/USER] (expressed as x & h is scope adjustment of 30moa) is x=hsin(theta)=314.1”sin(1deg)=5.48”. And this doesn’t include the vertical poi shift. So you see the cant of a reticle to the bore is inconsequential and the cant of the reticle to gravity is critical at extended ranges (124.5 times more critical). [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Scope Not Level With My Action
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