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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
MOA readings
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<blockquote data-quote="britz" data-source="post: 200015" data-attributes="member: 7865"><p>Yes. most likely</p><p> 60 inches at 600 yards is 10 inches per hundred yards. Inches Per hundred Yards (IPHY) is very close to MOA (1.047" per 100). If your scope has 58 MOA adjustement, you will likely have about 29 MOA of elevation (half of the total MOA of adjustment). I can't say for sure because sometimes scopes are mounted in such a way that you use up more of the elevation adjusment to atain a zero because the scope is mounted at a slight angle. BUT, most of the time your scope and bore will be paralell to eachother allowing you approximately half of your total adjustment to be useful in elevation adjustment after you are zerod in at 100 yards (half of the ajustment would be available for raising your crosshair and half would be avialable for lowering your crosshair).</p><p></p><p>When we say Inches Per Hundred Yards (IPHY), it is just that: so many inches of elevation for every hundred yards. So for the next few examples we will use the following number that I pulled out of my hat - 15 (IPHY). If you take 15 inches per hundred (what many incorectly call MOA), for every hundred yards you move away - you multiply the moa by that number inorder to atain the actual drop at a certain range. Ie. if you are at 100 yards you take 15 (IPHY) x 1 = 15 inches. if you are at 300 yards you take 15 (IPHY) x 3 = 45 inches. if you are at 800 yards you take 15 (IPHY) times 8 = 120 inches and so on. </p><p></p><p>I decided to add this to help clairfy the difference; if you take the same case in MOA, it would be 15 moa is (15 x 1.047 x how many hundred yards). Ie. at 100 yards you take 15 x 1.047 x 1 = 15.7". 15 MOA at 300 yards is 15 x 1.047 x 3 = 47.1". 15 MOA at 800 is 15 x 1.047 x 8 = 125.6".</p><p></p><p>here is where it gets tricky 1 MOA is acutally 1.047 inches per hundred yards. This means vertually nothing at close and mid range. However, when you start to adjust your scope 15-20 units (MOA or IPHY)and are trying to hit a target at several hundred yards away. that .047" per unit per hundred yards starts to add up in a hurry. My 300 wsm with a zero at 200 will miss a 600 yard target by something like a foot ( slight exageration I guess) if I am using calcuations for MOA and adjusting a scope that is set for IPHY.</p></blockquote><p></p>
[QUOTE="britz, post: 200015, member: 7865"] Yes. most likely 60 inches at 600 yards is 10 inches per hundred yards. Inches Per hundred Yards (IPHY) is very close to MOA (1.047" per 100). If your scope has 58 MOA adjustement, you will likely have about 29 MOA of elevation (half of the total MOA of adjustment). I can't say for sure because sometimes scopes are mounted in such a way that you use up more of the elevation adjusment to atain a zero because the scope is mounted at a slight angle. BUT, most of the time your scope and bore will be paralell to eachother allowing you approximately half of your total adjustment to be useful in elevation adjustment after you are zerod in at 100 yards (half of the ajustment would be available for raising your crosshair and half would be avialable for lowering your crosshair). When we say Inches Per Hundred Yards (IPHY), it is just that: so many inches of elevation for every hundred yards. So for the next few examples we will use the following number that I pulled out of my hat - 15 (IPHY). If you take 15 inches per hundred (what many incorectly call MOA), for every hundred yards you move away - you multiply the moa by that number inorder to atain the actual drop at a certain range. Ie. if you are at 100 yards you take 15 (IPHY) x 1 = 15 inches. if you are at 300 yards you take 15 (IPHY) x 3 = 45 inches. if you are at 800 yards you take 15 (IPHY) times 8 = 120 inches and so on. I decided to add this to help clairfy the difference; if you take the same case in MOA, it would be 15 moa is (15 x 1.047 x how many hundred yards). Ie. at 100 yards you take 15 x 1.047 x 1 = 15.7". 15 MOA at 300 yards is 15 x 1.047 x 3 = 47.1". 15 MOA at 800 is 15 x 1.047 x 8 = 125.6". here is where it gets tricky 1 MOA is acutally 1.047 inches per hundred yards. This means vertually nothing at close and mid range. However, when you start to adjust your scope 15-20 units (MOA or IPHY)and are trying to hit a target at several hundred yards away. that .047" per unit per hundred yards starts to add up in a hurry. My 300 wsm with a zero at 200 will miss a 600 yard target by something like a foot ( slight exageration I guess) if I am using calcuations for MOA and adjusting a scope that is set for IPHY. [/QUOTE]
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