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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Cosine/angle
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<blockquote data-quote="Buffalobob" data-source="post: 157071" data-attributes="member: 8"><p>Robbor</p><p></p><p>Most scopes are graduated in 0.25 inches or MOA as the case may be.</p><p></p><p>At 1000 yards 0.25 MOA is about 2.5 inches at 2000 yards it is about 5 inches. If all other things are correct then by being off 0.125MOA one would still be very well within the kill zone of any reasonable target, military or hunting. So your angle indicator shoud be accurate to within 0.125 MOA So you can know whether to round up or down to the next click.</p><p></p><p>From the need to be accurate to with 0.125 MOA one can back into the accuracy of the measuring unit. It is not the distance that is important it is the drop that is important</p><p></p><p>If you wish to look up some arcane and really boring mathematical theory google up "significant digits". If your scope is only accurate to two digits then you should proceed accordingly. While that sounds simple there are very long and tediuos books written on this subject and two or three times in my life as an engineer it has actually been important.</p><p></p><p>There are thoughts in my mind about how to solve your problem and I am sure Catshooter or Gustavo can also answer your question just as easily as me. I am not an expert on the subject but I can help you with it if you wish. My email is in my profile</p><p></p><p></p><p>For my own personal use, I only believe accuracy is needed to the one or two degree level because my shooting skills are not much better than that. /ubbthreads/images/graemlins/confused.gif I use an inclinometer from a compass and carry a cosine card for conversions and do math in my head. And then I add or subtract clicks by "intuition". What a lousy scientist I am.</p></blockquote><p></p>
[QUOTE="Buffalobob, post: 157071, member: 8"] Robbor Most scopes are graduated in 0.25 inches or MOA as the case may be. At 1000 yards 0.25 MOA is about 2.5 inches at 2000 yards it is about 5 inches. If all other things are correct then by being off 0.125MOA one would still be very well within the kill zone of any reasonable target, military or hunting. So your angle indicator shoud be accurate to within 0.125 MOA So you can know whether to round up or down to the next click. From the need to be accurate to with 0.125 MOA one can back into the accuracy of the measuring unit. It is not the distance that is important it is the drop that is important If you wish to look up some arcane and really boring mathematical theory google up "significant digits". If your scope is only accurate to two digits then you should proceed accordingly. While that sounds simple there are very long and tediuos books written on this subject and two or three times in my life as an engineer it has actually been important. There are thoughts in my mind about how to solve your problem and I am sure Catshooter or Gustavo can also answer your question just as easily as me. I am not an expert on the subject but I can help you with it if you wish. My email is in my profile For my own personal use, I only believe accuracy is needed to the one or two degree level because my shooting skills are not much better than that. [img]/ubbthreads/images/graemlins/confused.gif[/img] I use an inclinometer from a compass and carry a cosine card for conversions and do math in my head. And then I add or subtract clicks by "intuition". What a lousy scientist I am. [/QUOTE]
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