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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Scope base: 20* or not?
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<blockquote data-quote="Eaglet" data-source="post: 498419" data-attributes="member: 3756"><p>MSU Marksman,</p><p></p><p>When your rifle scope is optically centered, using <strong>flat base</strong> would take about... let's say 3.92 MOA of upward adjustment on the turret to zero your rifle at 100 yards.</p><p></p><p>If your scope has a total of 40 MOA, 40/2=<strong>20 MOA</strong> left from center to all the way to the top. But because you need approximately 3.92 MOA of upward turret adjustment to zero at 100 yards you would only have about 16.08 MOA left of upward adjustment for long range shooting.</p><p></p><p>If instead of using a flat <strong>0</strong> MOA base we use a <strong>20</strong> MOA base, now we </p><p>would go like this:20 MOA that you have from your rifle scope, + 20 MOA from the </p><p>base would = <strong>40 MOA</strong>. <span style="color: SlateGray">But you'll loose 3.92 MOA.</span></p><p></p><p>Now you would need to turn the turret downwards</p><p>16.08 MOA to be zeroed at 100 yards. That would mean that now you would have</p><p><strong>20+16.08=36.08 MOA</strong> left of upward turret adjustment to shoot at long range...</p><p></p><p>The only way I could explain your experience would be making the assumption</p><p>that you installed the 20 MOA base backwards; now the scope is aiming upwards </p><p>instead of downwards in relation to the barrel. If that were so, then to zero at 100 yards you would have to dial upward the 20 MOA of the base + the 3.92 MOA </p><p>which would total 23.92 MOA of upward movement when you only had 20 MOA of turret adjustment to begin with. Now you would be all the way to the top on the turret and never on target at 100 yards.</p><p></p><p>Hope it helps.</p></blockquote><p></p>
[QUOTE="Eaglet, post: 498419, member: 3756"] MSU Marksman, When your rifle scope is optically centered, using [B]flat base[/B] would take about... let's say 3.92 MOA of upward adjustment on the turret to zero your rifle at 100 yards. If your scope has a total of 40 MOA, 40/2=[B]20 MOA[/B] left from center to all the way to the top. But because you need approximately 3.92 MOA of upward turret adjustment to zero at 100 yards you would only have about 16.08 MOA left of upward adjustment for long range shooting. If instead of using a flat [B]0[/B] MOA base we use a [B]20[/B] MOA base, now we would go like this:20 MOA that you have from your rifle scope, + 20 MOA from the base would = [B]40 MOA[/B]. [COLOR="SlateGray"]But you'll loose 3.92 MOA.[/COLOR] Now you would need to turn the turret downwards 16.08 MOA to be zeroed at 100 yards. That would mean that now you would have [B]20+16.08=36.08 MOA[/B] left of upward turret adjustment to shoot at long range... The only way I could explain your experience would be making the assumption that you installed the 20 MOA base backwards; now the scope is aiming upwards instead of downwards in relation to the barrel. If that were so, then to zero at 100 yards you would have to dial upward the 20 MOA of the base + the 3.92 MOA which would total 23.92 MOA of upward movement when you only had 20 MOA of turret adjustment to begin with. Now you would be all the way to the top on the turret and never on target at 100 yards. Hope it helps. [/QUOTE]
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Long Range Scopes and Other Optics
Scope base: 20* or not?
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