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Rifles, Reloading, Optics, Equipment
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Cosine Indicator
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<blockquote data-quote="ricka0" data-source="post: 57621" data-attributes="member: 3086"><p>I see what your saying. I think you were thinking like a practical hunter /ubbthreads/images/graemlins/cool.gif and I was an unclear ***-uming mathamatican /ubbthreads/images/graemlins/frown.gif /ubbthreads/images/graemlins/confused.gif Yes, you can't linearly map MOA to 1" - actually MOA comes from </p><p> <strong>SIN(1/60*PI()/180)*100*3*12= <font color="red"> 1.047197536</strong></p><p><strong></strong> </font> (well to as many digits as Excel will go. And yes those factors come into play.</p><p>Suppose you move the target @ 100 yds up 150 yards. (pointing above 45 deg up (actuall atan(150/100) = 56deg)</p><p></p><p>150yards * 3ft/yard * 12"/foot = 5400 inches.</p><p>Now move your scope up 5400 MOA - and you get your scope pointing 90 degrees up - as 90 degrees * 60min/degree = 5400 MOA.</p><p></p><p>So what's the best way to use the cos level do ma jig when you're in the hills? I could write a program for WinCe PDA's that uses the improved formula. Or you could just sight your rifle in at the bore (not 100 yards) so drop = path, then you can use the simple cos formula. See my web page and please offer improvements to it.</p><p></p><p> <a href="http://groups.msn.com/ultralongrangehunting/cos1.msnw" target="_blank">ricka's explaination of the improved cos formula</a></p></blockquote><p></p>
[QUOTE="ricka0, post: 57621, member: 3086"] I see what your saying. I think you were thinking like a practical hunter [img]/ubbthreads/images/graemlins/cool.gif[/img] and I was an unclear ***-uming mathamatican [img]/ubbthreads/images/graemlins/frown.gif[/img] [img]/ubbthreads/images/graemlins/confused.gif[/img] Yes, you can't linearly map MOA to 1" - actually MOA comes from [b]SIN(1/60*PI()/180)*100*3*12= <font color="red"> 1.047197536 [/b] </font> (well to as many digits as Excel will go. And yes those factors come into play. Suppose you move the target @ 100 yds up 150 yards. (pointing above 45 deg up (actuall atan(150/100) = 56deg) 150yards * 3ft/yard * 12"/foot = 5400 inches. Now move your scope up 5400 MOA - and you get your scope pointing 90 degrees up - as 90 degrees * 60min/degree = 5400 MOA. So what's the best way to use the cos level do ma jig when you're in the hills? I could write a program for WinCe PDA's that uses the improved formula. Or you could just sight your rifle in at the bore (not 100 yards) so drop = path, then you can use the simple cos formula. See my web page and please offer improvements to it. [url="http://groups.msn.com/ultralongrangehunting/cos1.msnw"]ricka's explaination of the improved cos formula[/url] [/QUOTE]
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