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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
NP-R2 Range Estimation
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<blockquote data-quote="Brent" data-source="post: 15421" data-attributes="member: 99"><p>Hey Luke,</p><p></p><p>The best resolution I think the R2 reticle provides is .2 moa, or 1 tenth of a line. This is pretty easy to break down like this. The 12-42x56 has the advantage of twice this resolution if set on 42 power and would be .1 moa. On 42x the lines are equal to 1 moa now not 2 moa. </p><p></p><p>The best use of the 5.5-22x NF is with bigger targets in the 36-40" range. Here you can stay under about 30-35 yards per .2 moa increment. If the target is say 20" like your example, it is much more difficult to range to within this 30-35 yard range. </p><p></p><p>The larger the targets size you're dividing into the more closely each range increment will be to each other. Range increments get farther apart the longer the range as well. This is the exact opposite of what we want as a LR hunter too. </p><p></p><p>After about 800 yards the the distance between each .2 moa increment on a 40" target is stretching to over 30 yards so it does have it's limitations beyond this. On a 20 inch target the limit might be around 600 yards. If you are using a 42x NF this of course would be a different story because of it's greater resolution. </p><p></p><p>The method I use is to measure the animal and count the number of lines high, say 2.7 lines. I divide half the targets size by this number and move the decimal two places to the right. Example; 40" chest on this moose measures 2.7 lines tall. Half the chest size 20"/2.7 lines = 7.40 or 740 yards.</p><p></p><p>Examples of other increments with a 40" target would be;</p><p></p><p>3.0 = 666 yards</p><p>2.9 = 689</p><p>2.8 = 714</p><p>2.7 = 740</p><p>2.6 = 769</p><p>2.5 = 800</p><p>2.4 = 833</p><p>2.3 = 869</p><p>2.2 = 909</p><p>2.1 = 952</p><p>2.0 = 1000</p><p></p><p>If you do the same thing using a 20" target (dividing by half that though) you'll see a much larger distance between the one tenth increments though.</p><p></p><p>Examples of other increments with a 20" target would be;</p><p></p><p>2.0 = 500 yards</p><p>1.9 = 526</p><p>1.8 = 555</p><p>1.7 = 588</p><p>1.6 = 625</p><p>1.5 = 666</p><p>1.4 = 714</p><p>1.3 = 769</p><p>1.2 = 833</p><p>1.1 = 909</p><p>1.0 = 1000</p><p> </p><p>In the same range, you can see the smaller target doesn't work as well and range increments are far too large to be usefull past about 600yds. If you factor in about a 10% error for judging the targets size, which could be at an angle or obstructed some, you'd probably be safe to 800 yards or so if you're shooting a high BC bullet at pretty high velocity on a 36-40" rangeable object. </p><p></p><p>How are you judging size using the Mil-Dot to within .05 mil? Are you able to do this in increments of .05 mil? </p><p></p><p>Given the fact that .05 mil is about .2 moa, that would be comparable to the NF 5.5-22 or 8-32, but again the 12-42 would give double this resolution.</p><p></p><p>I don't see how the mil-dot can give increments of .05 mil (or .2 moa) but I'm open to ideas. It does have an outer ring that is .2 moa thick and a center dot that is .1 moa in size, I guess you could use these sizes in multiples to an extent, but as far as offering .05 mil or .2 moa increments that isn't there. This is one difficult thing to deal with, for me anyway.</p><p></p><p>Here's something that might help with the mil-dot.</p><p></p><p><strong>Mil-Dot specs;</strong></p><p><strong></strong></p><p><strong>1.0 mil = 3.6 moa (dots between centers)</strong></p><p><strong>.88 mil = 3.2 moa (center crosshair to edge of first dot)</strong></p><p><strong>.75 mil = 2.7 moa (between edges of dots)</strong></p><p><strong>.50 mil = 1.8 moa (half way between dot centers)</strong></p><p><strong>.25 mil = 0.9 moa (size of dot)</strong></p><p><strong>.13 mil = 0.5 moa (half size of dot)</strong></p><p><strong>.06 mil = 0.2 moa (thickness of dots outer ring) Nightforce Mil-Dot</strong></p><p><strong>.03 mil = 0.1 moa (center dot size) Nightforce Mil-Dot</strong></p><p></p><p>[ 02-17-2003: Message edited by: Brent ]</p></blockquote><p></p>
[QUOTE="Brent, post: 15421, member: 99"] Hey Luke, The best resolution I think the R2 reticle provides is .2 moa, or 1 tenth of a line. This is pretty easy to break down like this. The 12-42x56 has the advantage of twice this resolution if set on 42 power and would be .1 moa. On 42x the lines are equal to 1 moa now not 2 moa. The best use of the 5.5-22x NF is with bigger targets in the 36-40" range. Here you can stay under about 30-35 yards per .2 moa increment. If the target is say 20" like your example, it is much more difficult to range to within this 30-35 yard range. The larger the targets size you're dividing into the more closely each range increment will be to each other. Range increments get farther apart the longer the range as well. This is the exact opposite of what we want as a LR hunter too. After about 800 yards the the distance between each .2 moa increment on a 40" target is stretching to over 30 yards so it does have it's limitations beyond this. On a 20 inch target the limit might be around 600 yards. If you are using a 42x NF this of course would be a different story because of it's greater resolution. The method I use is to measure the animal and count the number of lines high, say 2.7 lines. I divide half the targets size by this number and move the decimal two places to the right. Example; 40" chest on this moose measures 2.7 lines tall. Half the chest size 20"/2.7 lines = 7.40 or 740 yards. Examples of other increments with a 40" target would be; 3.0 = 666 yards 2.9 = 689 2.8 = 714 2.7 = 740 2.6 = 769 2.5 = 800 2.4 = 833 2.3 = 869 2.2 = 909 2.1 = 952 2.0 = 1000 If you do the same thing using a 20" target (dividing by half that though) you'll see a much larger distance between the one tenth increments though. Examples of other increments with a 20" target would be; 2.0 = 500 yards 1.9 = 526 1.8 = 555 1.7 = 588 1.6 = 625 1.5 = 666 1.4 = 714 1.3 = 769 1.2 = 833 1.1 = 909 1.0 = 1000 In the same range, you can see the smaller target doesn't work as well and range increments are far too large to be usefull past about 600yds. If you factor in about a 10% error for judging the targets size, which could be at an angle or obstructed some, you'd probably be safe to 800 yards or so if you're shooting a high BC bullet at pretty high velocity on a 36-40" rangeable object. How are you judging size using the Mil-Dot to within .05 mil? Are you able to do this in increments of .05 mil? Given the fact that .05 mil is about .2 moa, that would be comparable to the NF 5.5-22 or 8-32, but again the 12-42 would give double this resolution. I don't see how the mil-dot can give increments of .05 mil (or .2 moa) but I'm open to ideas. It does have an outer ring that is .2 moa thick and a center dot that is .1 moa in size, I guess you could use these sizes in multiples to an extent, but as far as offering .05 mil or .2 moa increments that isn't there. This is one difficult thing to deal with, for me anyway. Here's something that might help with the mil-dot. [B]Mil-Dot specs; 1.0 mil = 3.6 moa (dots between centers) .88 mil = 3.2 moa (center crosshair to edge of first dot) .75 mil = 2.7 moa (between edges of dots) .50 mil = 1.8 moa (half way between dot centers) .25 mil = 0.9 moa (size of dot) .13 mil = 0.5 moa (half size of dot) .06 mil = 0.2 moa (thickness of dots outer ring) Nightforce Mil-Dot .03 mil = 0.1 moa (center dot size) Nightforce Mil-Dot[/B] [ 02-17-2003: Message edited by: Brent ] [/QUOTE]
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