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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistics Question
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<blockquote data-quote="Mikecr" data-source="post: 653327" data-attributes="member: 1521"><p>Depends on your ballistic calculator, and what your scope ends up adjusting at.</p><p>If it is true MOA (1.0472 IPHY) you would select appropriate MOA value per click(1,1/2,1/4, 1/8).</p><p>If it's inches per 100yds(IPHY) you should be able to enter the specific value of your adjustment.</p><p></p><p>If your scope is in MOA, you can dial up 10moa, and this should take you up just a shade(~1/32) under 10.5 IPHY. But don't over generalize this, or assume anything. Most scopes are not true MOA..</p><p>I've seen NF NXS scopes that are not(1.09 IPHY), and so far the only scopes I've tested that turned out true MOA have been Leupold's Mk4 scopes.</p><p></p><p>This can be a significant source of error for single shots in the field. </p><p>If you need 10moa to hit your mark @ 500yds, and you have your software set in MOA, but your scope is actually IPHY, then you could be off ~1/2" per 100yds, or 2.5" at 500yds(just in adjustment error).</p><p>At 1kyd, and 30moa needed adjustment, you'd introduce over 14" of error.</p><p>This may be why holding off with moa reticles seems popular, as 30moa optical hold-off is just that.</p><p>But provided your adjustments are determined and properly accounted for, dialing is more precise than optical hold-offs(e.g. between even hash marks, +/- subtension errors).</p></blockquote><p></p>
[QUOTE="Mikecr, post: 653327, member: 1521"] Depends on your ballistic calculator, and what your scope ends up adjusting at. If it is true MOA (1.0472 IPHY) you would select appropriate MOA value per click(1,1/2,1/4, 1/8). If it's inches per 100yds(IPHY) you should be able to enter the specific value of your adjustment. If your scope is in MOA, you can dial up 10moa, and this should take you up just a shade(~1/32) under 10.5 IPHY. But don't over generalize this, or assume anything. Most scopes are not true MOA.. I've seen NF NXS scopes that are not(1.09 IPHY), and so far the only scopes I've tested that turned out true MOA have been Leupold's Mk4 scopes. This can be a significant source of error for single shots in the field. If you need 10moa to hit your mark @ 500yds, and you have your software set in MOA, but your scope is actually IPHY, then you could be off ~1/2" per 100yds, or 2.5" at 500yds(just in adjustment error). At 1kyd, and 30moa needed adjustment, you'd introduce over 14" of error. This may be why holding off with moa reticles seems popular, as 30moa optical hold-off is just that. But provided your adjustments are determined and properly accounted for, dialing is more precise than optical hold-offs(e.g. between even hash marks, +/- subtension errors). [/QUOTE]
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