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Long Range Hunting & Shooting
bracketing game with scope
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<blockquote data-quote="sscoyote" data-source="post: 321678" data-attributes="member: 1133"><p>Yes u can use the stadia in a reticle to measure the distance to a tgt. of KNOWN dimension. The best way to accomplish this is to apply the "modified mil-ranging formula." All rangefinding with reticles (stadiametric rangefinding) is based on this simplified equation. Here it is (inches to yds.)--</p><p></p><p>tgt. size (") x range of reticle subtension (usually 100 yds.) / reticle subtension (") / quantity of gap tgt. occupies between stadia (decimal equivalent) = range (yds.)</p><p></p><p>...looks complicated, but quite simple to apply--</p><p></p><p>Example--sounds like u have the NP-R1 reticle (maybe R2?). If it's the R1 then i think the stadia to stadia gap is 1 inch per 100 yds. in that reticle (better check that 1--don't know for sure). Suppose u look at your big bull elk at an unknown distance and u see that he occupies 3 and 1/4 of the 1 IPHY stadia units. Most folks say that the avg. bull elk is 25" back to brisket, but this guys a biggie so lets give him 2 more inches at 27. Now just fill in the variables in the equation--</p><p></p><p>27 x 100 / 1.0 / 3.25 = 830 yds.</p><p></p><p>...BUT...it's not really that easy oftentimes. Obviously u need to guess the tgt. size correctly, and guess the "gap" correctly too. </p><p></p><p>Now let's see how far off u will be if u're off in tgt. size by only 1"--</p><p></p><p>2600/3.25=800</p><p>2800/3.25=861</p><p></p><p>so as u can see +/-1" gives 60 yds. variation in range estimation, and thats assuming u've guessed the gap accurately to a level of 1/20th of it's subtension (.05).</p><p></p><p>It should be obvious that as range increases the error increases geometrically.</p><p></p><p>I've found reticle rangefinding with scopes is fairly accurate to 400-500 yds. and then drops off dramatically beyond that.</p></blockquote><p></p>
[QUOTE="sscoyote, post: 321678, member: 1133"] Yes u can use the stadia in a reticle to measure the distance to a tgt. of KNOWN dimension. The best way to accomplish this is to apply the "modified mil-ranging formula." All rangefinding with reticles (stadiametric rangefinding) is based on this simplified equation. Here it is (inches to yds.)-- tgt. size (") x range of reticle subtension (usually 100 yds.) / reticle subtension (") / quantity of gap tgt. occupies between stadia (decimal equivalent) = range (yds.) ...looks complicated, but quite simple to apply-- Example--sounds like u have the NP-R1 reticle (maybe R2?). If it's the R1 then i think the stadia to stadia gap is 1 inch per 100 yds. in that reticle (better check that 1--don't know for sure). Suppose u look at your big bull elk at an unknown distance and u see that he occupies 3 and 1/4 of the 1 IPHY stadia units. Most folks say that the avg. bull elk is 25" back to brisket, but this guys a biggie so lets give him 2 more inches at 27. Now just fill in the variables in the equation-- 27 x 100 / 1.0 / 3.25 = 830 yds. ...BUT...it's not really that easy oftentimes. Obviously u need to guess the tgt. size correctly, and guess the "gap" correctly too. Now let's see how far off u will be if u're off in tgt. size by only 1"-- 2600/3.25=800 2800/3.25=861 so as u can see +/-1" gives 60 yds. variation in range estimation, and thats assuming u've guessed the gap accurately to a level of 1/20th of it's subtension (.05). It should be obvious that as range increases the error increases geometrically. I've found reticle rangefinding with scopes is fairly accurate to 400-500 yds. and then drops off dramatically beyond that. [/QUOTE]
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