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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Questions on MOA and adjustments
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<blockquote data-quote="britz" data-source="post: 200404" data-attributes="member: 7865"><p>Many people use the term MOA meaning IPHY because it is easior to say and many don't know the difference. The two are quite close - but not quite interchangable. 1 MOA is actually 1.047" at 100 yards and 2.094" at 200 yards and so on.</p><p></p><p>Your target is 500 yards away and you said that the drop is 37.5" (your bullet will hit 37.5 inches lower than your point of aim at that range). You take 37.5 devided by 5 to get to inches per hundred = 7.5. That means that you have to move your scope 7.5 IPHY to impact right on at 500 yards. 7.5 IPHY is 60 1/8th inch clicks or 30 1/4inch clicks (7.5 x 8 = 60).</p><p></p><p>7.5 MOA at 500 yards is actually 7.5 x 1.047 x 5 = 39.26 inches - a difference of only 1.75 inches. However, If my 300wsm is zeroed at 100 and I am shooting 800 yards. I need 19.2 MOA increase which equates to 161.2 inches at 800. If I turn my scope 19.2 IPHY I will only move the point of impact 153.6 inches missing the target by 7.6 inches. So as you can see it doesn't make that big of a difference until you get out there quite aways. I only realized the significance of it a last summer when shooting at 4 inch balloons at 550 yards away w/ my 300wsm.</p></blockquote><p></p>
[QUOTE="britz, post: 200404, member: 7865"] Many people use the term MOA meaning IPHY because it is easior to say and many don't know the difference. The two are quite close - but not quite interchangable. 1 MOA is actually 1.047" at 100 yards and 2.094" at 200 yards and so on. Your target is 500 yards away and you said that the drop is 37.5" (your bullet will hit 37.5 inches lower than your point of aim at that range). You take 37.5 devided by 5 to get to inches per hundred = 7.5. That means that you have to move your scope 7.5 IPHY to impact right on at 500 yards. 7.5 IPHY is 60 1/8th inch clicks or 30 1/4inch clicks (7.5 x 8 = 60). 7.5 MOA at 500 yards is actually 7.5 x 1.047 x 5 = 39.26 inches - a difference of only 1.75 inches. However, If my 300wsm is zeroed at 100 and I am shooting 800 yards. I need 19.2 MOA increase which equates to 161.2 inches at 800. If I turn my scope 19.2 IPHY I will only move the point of impact 153.6 inches missing the target by 7.6 inches. So as you can see it doesn't make that big of a difference until you get out there quite aways. I only realized the significance of it a last summer when shooting at 4 inch balloons at 550 yards away w/ my 300wsm. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Questions on MOA and adjustments
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