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Difference between 1/4" or 1/4 MOA clicks?
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<blockquote data-quote="7magcreedmoor" data-source="post: 1335455" data-attributes="member: 48559"><p>Ah, the old "rounding error" problem. Calling 1 MOA an inch at a hundred yards is okay for the first couple hundred yards. Take 400 yards for example: from a 100 yard zero your dope might call for 5.8 MOA up, which is 24.29 inches using true MOA but 23.2 inches using rounded off MOA. Hitting within 1 inch of your point of aim at 400 will make most of us quite happy, especially if there are witnesses. But rounding it off will start to cause problems if you shoot far enough. 10 inches compared to 10.47 inches is the difference between one "actual" MOA and one "shooter's" MOA at 1000 yards. Doesn't seem like a big deal, does it? A typical "high power" centerfire load might require 25 MOA dial up from a 100 yard zero to hit a 1000 yard target. Now we will have an issue, as 25 times the 0.47 inch discrepancy will have us hitting a foot high or low depending on which of your tools was using the rounded off figure. The error won't be as apparent in windage, as a 10mph wind correction at 1000 will likely be somewhere between 5 MOA depending on the BC of the load, so 5 times that 0.47" error and you hit plus/minus 2.5 inches from where you'd hoped. You would likely write that off to a "bad wind call" and go on about your business.</p></blockquote><p></p>
[QUOTE="7magcreedmoor, post: 1335455, member: 48559"] Ah, the old "rounding error" problem. Calling 1 MOA an inch at a hundred yards is okay for the first couple hundred yards. Take 400 yards for example: from a 100 yard zero your dope might call for 5.8 MOA up, which is 24.29 inches using true MOA but 23.2 inches using rounded off MOA. Hitting within 1 inch of your point of aim at 400 will make most of us quite happy, especially if there are witnesses. But rounding it off will start to cause problems if you shoot far enough. 10 inches compared to 10.47 inches is the difference between one "actual" MOA and one "shooter's" MOA at 1000 yards. Doesn't seem like a big deal, does it? A typical "high power" centerfire load might require 25 MOA dial up from a 100 yard zero to hit a 1000 yard target. Now we will have an issue, as 25 times the 0.47 inch discrepancy will have us hitting a foot high or low depending on which of your tools was using the rounded off figure. The error won't be as apparent in windage, as a 10mph wind correction at 1000 will likely be somewhere between 5 MOA depending on the BC of the load, so 5 times that 0.47" error and you hit plus/minus 2.5 inches from where you'd hoped. You would likely write that off to a "bad wind call" and go on about your business. [/QUOTE]
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Difference between 1/4" or 1/4 MOA clicks?
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