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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Heads up on leupold scopes (MOA vs IPHY)
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<blockquote data-quote="bruce_ventura" data-source="post: 682467" data-attributes="member: 34084"><p>I would not trust advice from a tech support person on this issue. If the 4.7% difference between MOA and IPHY is important to you, then I suggest that you calibrate your scope carefully and accurately at the range. That means: <ol> <li data-xf-list-type="ol">Place the rifle on a rest located directly <u>under the objective bell</u>, so that there is no confusion about which angle you"re measuring, and you've minimized vertical gun movement between elevation settings.</li> <li data-xf-list-type="ol">Measure the target range from the pivot point of your rifle (center of the rest).</li> <li data-xf-list-type="ol">Fire five shot groups at zero and -10 "MOA" (indicated), and zero and +10 "MOA" (indicated). Use a single sheet of paper for each comparison. That's three or four five-shot groups, depending on the size of your paper.</li> <li data-xf-list-type="ol">Fire a couple of fouling shots and then fire your five-shot groups, allowing five minutes between each shot for the barrel to cool. Use the center of each five shot group to establish the point of impact (POI).</li> <li data-xf-list-type="ol">Use a laser rangefinder and a steel ruler to measure distances for POI locations.</li> <li data-xf-list-type="ol">Make your measurements and do the math.</li> </ol><p>That's how I would do it. While I was at it, I would use this live fire test to confirm that my elevation turret is properly aligned to the rifle. That's a topic for another thread, however.</p><p> </p><p>Please report your results here.</p></blockquote><p></p>
[QUOTE="bruce_ventura, post: 682467, member: 34084"] I would not trust advice from a tech support person on this issue. If the 4.7% difference between MOA and IPHY is important to you, then I suggest that you calibrate your scope carefully and accurately at the range. That means:[LIST=1] [*]Place the rifle on a rest located directly [U]under the objective bell[/U], so that there is no confusion about which angle you"re measuring, and you've minimized vertical gun movement between elevation settings. [*]Measure the target range from the pivot point of your rifle (center of the rest). [*]Fire five shot groups at zero and -10 "MOA" (indicated), and zero and +10 "MOA" (indicated). Use a single sheet of paper for each comparison. That's three or four five-shot groups, depending on the size of your paper. [*]Fire a couple of fouling shots and then fire your five-shot groups, allowing five minutes between each shot for the barrel to cool. Use the center of each five shot group to establish the point of impact (POI). [*]Use a laser rangefinder and a steel ruler to measure distances for POI locations. [*]Make your measurements and do the math. [/LIST]That's how I would do it. While I was at it, I would use this live fire test to confirm that my elevation turret is properly aligned to the rifle. That's a topic for another thread, however. Please report your results here. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Heads up on leupold scopes (MOA vs IPHY)
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