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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New ballistics program for Android phones
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<blockquote data-quote="BryanLitz" data-source="post: 445093" data-attributes="member: 7848"><p>You figure out your correction factor like this:</p><p></p><p>Shoot a group to your zero at 100 yards (make sure you measure the range exactly).</p><p></p><p>Then dial the elevation up 20 or 30 MOA (this requires a tall target) and shoot another group.</p><p></p><p>Measure the <em>actual</em> distance between the group centers.</p><p></p><p>Divide by the <em>intended</em> movement of the group.</p><p></p><p>For example, let's say you dialed 20 MOA, and the group moved 25.6" at 100 yards. The group should have moved: 20*1.047 = 20.94". So the POI moved more than it should have. In fact it moved 25.6/20.94 = 1.22 times farther than it should have. In order to correct for the fact that you scope moves more than expected, the correction factor has to be 1/1.22 = .82.</p><p></p><p>So applying a correction factor of .82 to your turret adjustments will result in an accurate adjustment.</p><p></p><p>A short-cut would be to divide the intended movement by the actual movement: </p><p>20.94/25.6 = .82. I went thru the above process to try and illustrate what the calculation is <em>doing</em>.</p><p></p><p>Take care,</p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 445093, member: 7848"] You figure out your correction factor like this: Shoot a group to your zero at 100 yards (make sure you measure the range exactly). Then dial the elevation up 20 or 30 MOA (this requires a tall target) and shoot another group. Measure the [I]actual[/I] distance between the group centers. Divide by the [i]intended[/i] movement of the group. For example, let's say you dialed 20 MOA, and the group moved 25.6" at 100 yards. The group should have moved: 20*1.047 = 20.94". So the POI moved more than it should have. In fact it moved 25.6/20.94 = 1.22 times farther than it should have. In order to correct for the fact that you scope moves more than expected, the correction factor has to be 1/1.22 = .82. So applying a correction factor of .82 to your turret adjustments will result in an accurate adjustment. A short-cut would be to divide the intended movement by the actual movement: 20.94/25.6 = .82. I went thru the above process to try and illustrate what the calculation is [i]doing[/i]. Take care, -Bryan [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New ballistics program for Android phones
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