Re: Range Estimation with npr1vs r2
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Target In Sight</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: matchking</div><div class="ubbcode-body">The NP-R1 is superior in regards to range estimation, though not my first pick. If they made one with 2 moa marks on the vertical and horizontal, I think it would be a better reticle than either of the two mentioned.
Of course, unless one is rushed for time, their are more precise ways to range targets using a scope.</div></div>
Hi matchking,
I would like to learn those "more precise ways to range target using a scope", where can I find more information? Using the reticle to range is the only way I have learned so far, and be interest to learn more precise ways.
Thank you,
Dyl.. </div></div>
He's probably talking about using the turret for rangefinding assuming u can get the rig steady enuf to hold accurately enuf.
If i were using the R1, i'd make the 1 MOA my main subtension unit and just apply a modification of the mil-ranging formula like this for say a 10" tgt. that brackets 2.5 1 MOA stadia lines (inches to yds.)--
10 x 100 / 1.0472 / 2.5 = range
If u want to get even slightly more accurate subtract the thickness of 1 line since most guys try to bracket a tgt. between stadia lines instead of from center of line to center. Your main subtension unit would then be 1.0472-.065=.9822 (seems insignificant but could make a difference at longer ranges)--
10x100/.9822/2.5=410
IMO, the best way to range a target is to break up the smallest stadia to stadia gap into tenths of it's subtension for the most efficient rangefinding system possible with your reticle. In this case the "subtension unit factor"...constant... becomes 100/.9822=101.81. This makes it faster to calculate. If your only ranging 1 tgt. size then it's real easy as u can calculate the ranging dope before the shoot or just use a new "target-subtension unit factor" of 10 x 100/ .9822 = 1018.12 (for a 10" tgt.)
This is for vertical with the R1. If u anticipate using both vertical and horizontal then calculate subtension units for both and tape that info on your rig somewhere. What they should've done with that reticle was break up the last 2 MOA subtension into 2 1 MOA units so rangefinding is done at the most accurate level and std. for both vertical and horizontal use.
IMO the best way to learn rangefinding with reticles is to memorize the most basic form of the mil-ranging formula--
(inches to yards)--
tgt size (") x range of reticle subtension measurement (usually 100 yds.) / reticle subtension (") / gap tgt. occupies (decimal equivalent) = range (yds.)
This way u can "mil-range" with any multi-stadia reticle (including target turret subtension changes). The application of this concept is WAAAYY bigger than the mil-dot itself.