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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Holding over compared to dialing in MOA
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<blockquote data-quote="TiroFijo" data-source="post: 18147" data-attributes="member: 974"><p>I think the easiest way is BMGMike's approach:</p><p></p><p>1- From a ballistic program find the drop D(horizontal range) at 100 yds. This number will not have much of a variation in the real world, so don't worry to find out the "real" one.</p><p>2- Measure your scope height H (axis of scope to center of bore), 0.1" accuracy is fine.</p><p>3- Zero at 100 yds, horizontal range. When you are done, the angle between the line of sight and the bore line is veeery close to:</p><p>A = (D + H)/1.047</p><p>D and H in inches; angle A in MOA</p><p>As Brent stated this value is usually close to 4.0 MOA</p><p>4- Find out your come ups with a ballistic program, and validate them on a horizontal range. Now you have your confirmed come ups from the 100 yds baseline zero in MOA.</p><p>5- Add the angle A to your come ups (in MOA). Now you know the angle between sight line and bore line at any range, we'll call these values "scope elevation". Forget about drop, come ups, etc., just think in "scope elevation" from now on.</p><p>6- For angled shots, just use W's level (or any other device). </p><p>The formula is:</p><p>corrected "scope elevation" = "scope elevation"*cos angle </p><p></p><p>SIMPLE and FAST <img src="http://images/icons/grin.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://images/icons/grin.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Edited to add: to avoid confusion, when zeroing at 100 yds you may put the elevation turret "0" at: 100 yds zero setting - A (for example, back off 4.0 MOA).</p><p>This way the scope reads directly "scope elevation": when your scope is at "0" the erector is parallel to the bore, when it is at "A" setting it is zeroed at 100 yds, etc.</p><p></p><p>[ 02-05-2004: Message edited by: TiroFijo ]</p></blockquote><p></p>
[QUOTE="TiroFijo, post: 18147, member: 974"] I think the easiest way is BMGMike's approach: 1- From a ballistic program find the drop D(horizontal range) at 100 yds. This number will not have much of a variation in the real world, so don't worry to find out the "real" one. 2- Measure your scope height H (axis of scope to center of bore), 0.1" accuracy is fine. 3- Zero at 100 yds, horizontal range. When you are done, the angle between the line of sight and the bore line is veeery close to: A = (D + H)/1.047 D and H in inches; angle A in MOA As Brent stated this value is usually close to 4.0 MOA 4- Find out your come ups with a ballistic program, and validate them on a horizontal range. Now you have your confirmed come ups from the 100 yds baseline zero in MOA. 5- Add the angle A to your come ups (in MOA). Now you know the angle between sight line and bore line at any range, we'll call these values "scope elevation". Forget about drop, come ups, etc., just think in "scope elevation" from now on. 6- For angled shots, just use W's level (or any other device). The formula is: corrected "scope elevation" = "scope elevation"*cos angle SIMPLE and FAST [img]images/icons/grin.gif[/img] [img]images/icons/grin.gif[/img] Edited to add: to avoid confusion, when zeroing at 100 yds you may put the elevation turret "0" at: 100 yds zero setting - A (for example, back off 4.0 MOA). This way the scope reads directly "scope elevation": when your scope is at "0" the erector is parallel to the bore, when it is at "A" setting it is zeroed at 100 yds, etc. [ 02-05-2004: Message edited by: TiroFijo ] [/QUOTE]
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Holding over compared to dialing in MOA
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