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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
How do you use a Mil-Dot scope?
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<blockquote data-quote="sscoyote" data-source="post: 114218" data-attributes="member: 1133"><p>Hey Longgun, here it is--www.mildot.com</p><p></p><p>Unfortunately the subtensions aren't in my most recent catalog, but i remember the system is supposed to be exactly inversely proportional for that reticle/power ring(as magnification increases reticle subtension decreases) so at 14X the subtension should be right @ 3.09 inch per hundred yds. instead of 3.6. This would be the ranging chart for the above 16" coyote then--</p><p></p><p>16 x 100 / 3.09 / 2.0 (coyote fits between the dots perfectly @ 2.0 "stadia unit") = 260 yds.</p><p></p><p>Recognizing that 16x100/3.09 is a constant of 517.8 we can enter that into the calculator's memory, and finish the 16" to 3.09 IPHY subtension ranging chart as follows--</p><p></p><p>517.8 / 1.9 = 275</p><p></p><p>517.8 / 1.8 = 290</p><p></p><p>1.7 = 305</p><p></p><p>1.6 = 325</p><p></p><p>etc....</p><p></p><p>1.0 = 520</p><p></p><p>0.9 = 575</p><p></p><p>0.8 = 650</p><p></p><p>This provides for a slightly more accurate ranging system at .31 mil accuracy instead of .36. Plus u don't have to look at the power ring just before u "mil" the dog. Of course u can't use the mil-dot master (actually u could recognizing that 3.09 IPHY is 86% of 3.6 IPHY), but it does save a little time actually working the mil-dot master. Just have to look up at your range sticker.</p><p></p><p>But as u can see the range determination now becomes geometrically more critical (below 1.0 interpolation) such that interpolation and tgt. size must be measured very precisely to get an accurate enuf reading to be able to range it well enuf to expect a high degree of 1st shot connections on a 6" coyote vitals tgt. (point blank range is becoming much shorter as trajectory increases). This is why the 2nd generation mil-dots r so popular, since it takes a little variable out of the equation by providing a finer grid system to help with interpolation (.5 mil, 1.0 MOA, .2 mil, etc. in some reticles).</p></blockquote><p></p>
[QUOTE="sscoyote, post: 114218, member: 1133"] Hey Longgun, here it is--www.mildot.com Unfortunately the subtensions aren't in my most recent catalog, but i remember the system is supposed to be exactly inversely proportional for that reticle/power ring(as magnification increases reticle subtension decreases) so at 14X the subtension should be right @ 3.09 inch per hundred yds. instead of 3.6. This would be the ranging chart for the above 16" coyote then-- 16 x 100 / 3.09 / 2.0 (coyote fits between the dots perfectly @ 2.0 "stadia unit") = 260 yds. Recognizing that 16x100/3.09 is a constant of 517.8 we can enter that into the calculator's memory, and finish the 16" to 3.09 IPHY subtension ranging chart as follows-- 517.8 / 1.9 = 275 517.8 / 1.8 = 290 1.7 = 305 1.6 = 325 etc.... 1.0 = 520 0.9 = 575 0.8 = 650 This provides for a slightly more accurate ranging system at .31 mil accuracy instead of .36. Plus u don't have to look at the power ring just before u "mil" the dog. Of course u can't use the mil-dot master (actually u could recognizing that 3.09 IPHY is 86% of 3.6 IPHY), but it does save a little time actually working the mil-dot master. Just have to look up at your range sticker. But as u can see the range determination now becomes geometrically more critical (below 1.0 interpolation) such that interpolation and tgt. size must be measured very precisely to get an accurate enuf reading to be able to range it well enuf to expect a high degree of 1st shot connections on a 6" coyote vitals tgt. (point blank range is becoming much shorter as trajectory increases). This is why the 2nd generation mil-dots r so popular, since it takes a little variable out of the equation by providing a finer grid system to help with interpolation (.5 mil, 1.0 MOA, .2 mil, etc. in some reticles). [/QUOTE]
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How do you use a Mil-Dot scope?
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