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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
MOA vs MIL. In scope ajustments?
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<blockquote data-quote="sscoyote" data-source="post: 223566" data-attributes="member: 1133"><p>Bill, long-range shooting is a kick, and u've come to the right place for info., no doubt. The best way to understand reticle-rangefinding is to go right to the most basic formula. This way it becomes aparent that it can be used with any reticle (even archery sight pins if 1 wanted to), and u can also use it to calculate tgt. size, and easily see it's limitations as well. Here's the formula in it's most basic form (inches to yds.)--</p><p></p><p>tgt. size x range of reticle subtension measurement (usually 100 yds.) / reticle subtension (inches) / quantitity of gap tgt. occupies (decimal equivalent) = range (yds.)</p><p></p><p>...looks complicated but super-easy to apply. Here's the equation for an 18" deer that occupies 2.4 mils--</p><p></p><p>18 x 100 / 3.6 / 2.4 = 208</p><p></p><p>Recently at a long-range shoot one of the guys wanted to know how big the rectangular 1000 yd. tgt. was. We were using a mil-dot reticle that measured 2.1 inch per hundred yds. between dots at a higher power than what the mil was cald. for. The tgt. occupied 0.9 mils. Here's the equation making the tgt. size the unknown--</p><p></p><p>X" x 100 / 2.1 / 0.9 = 1000</p><p></p><p>X=18.9" when we went downrange and measured it it was 19.2". It just amazes me whenever i use this stuff just what can be accomplished with it. Now if we'd have known the tgt. size was 19.2" we would have got this range using the reticle if we didn't know it--</p><p></p><p>19.2 x 100 / 2.1 / 0.9 = 1016 yds.</p><p></p><p>Later a doe antelope ran by us and i thought to attempt to range it thru the reticle. It looked like it should be 1.8 mils just loping along, and it lasered at 362 yds. Using 14" as an "avg. back to brisket here it is--</p><p></p><p>14 x 100 / 2.1 / 1.8 = 370</p><p></p><p>Usually we can easily get within 3% of lasered with most reticles on hard tgts.</p><p></p><p>Nice thing about this form of the equation is that if u're after 1 tgt. size u can make the 1st 3 variables a factor. so for an antelope doe-- 14 x 100 / 2.1 = 667 this makes it quicker and easier to calculate.</p><p></p><p>I often put the subtensions of my reticles in the turret covers on a sticker just in case i need them.</p><p></p><p>Once u play around with the equation some it's very easy to memorize it, and even if u invert the bottom 2 divisors u'll still get the same range. This stuff is fun to play with, and is especially useful with simple plex reticles.</p></blockquote><p></p>
[QUOTE="sscoyote, post: 223566, member: 1133"] Bill, long-range shooting is a kick, and u've come to the right place for info., no doubt. The best way to understand reticle-rangefinding is to go right to the most basic formula. This way it becomes aparent that it can be used with any reticle (even archery sight pins if 1 wanted to), and u can also use it to calculate tgt. size, and easily see it's limitations as well. Here's the formula in it's most basic form (inches to yds.)-- tgt. size x range of reticle subtension measurement (usually 100 yds.) / reticle subtension (inches) / quantitity of gap tgt. occupies (decimal equivalent) = range (yds.) ...looks complicated but super-easy to apply. Here's the equation for an 18" deer that occupies 2.4 mils-- 18 x 100 / 3.6 / 2.4 = 208 Recently at a long-range shoot one of the guys wanted to know how big the rectangular 1000 yd. tgt. was. We were using a mil-dot reticle that measured 2.1 inch per hundred yds. between dots at a higher power than what the mil was cald. for. The tgt. occupied 0.9 mils. Here's the equation making the tgt. size the unknown-- X" x 100 / 2.1 / 0.9 = 1000 X=18.9" when we went downrange and measured it it was 19.2". It just amazes me whenever i use this stuff just what can be accomplished with it. Now if we'd have known the tgt. size was 19.2" we would have got this range using the reticle if we didn't know it-- 19.2 x 100 / 2.1 / 0.9 = 1016 yds. Later a doe antelope ran by us and i thought to attempt to range it thru the reticle. It looked like it should be 1.8 mils just loping along, and it lasered at 362 yds. Using 14" as an "avg. back to brisket here it is-- 14 x 100 / 2.1 / 1.8 = 370 Usually we can easily get within 3% of lasered with most reticles on hard tgts. Nice thing about this form of the equation is that if u're after 1 tgt. size u can make the 1st 3 variables a factor. so for an antelope doe-- 14 x 100 / 2.1 = 667 this makes it quicker and easier to calculate. I often put the subtensions of my reticles in the turret covers on a sticker just in case i need them. Once u play around with the equation some it's very easy to memorize it, and even if u invert the bottom 2 divisors u'll still get the same range. This stuff is fun to play with, and is especially useful with simple plex reticles. [/QUOTE]
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