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How well does the mil-dot range on coyote

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/16/2006 at 12:37
ba_50 View Drop Down
Optics Apprentice
Optics Apprentice


Joined: December/02/2004
Location: Illinois
Status: Offline
Points: 150
It looks like about 500 yards would be the limit. They would probably have to be measured by length. At 10x a coyote seems like it would be hard to measure. Anyone had any experience at it? Thanks
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2006 at 03:44
sscoyote View Drop Down
Optics Journeyman
Optics Journeyman


Joined: October/05/2004
Status: Offline
Points: 325

I have had some experience reticle-ranging antelope, and i can say that it's better than guessing. I have a lot of experience reticle-ranging hard tgts. such as steel silhouettes, and bowling pins, and since the tgt. dimensions r exactly known, reticle-ranging is much better than on a tgt. that is simply approximated in dimension. But, i think if a guy put some thought into it, it could be done with a fair amt. of accuracy. There r several factors that affect reticle-ranging. They r--

 

1) size of tgt. relative to reticle subtension

2) magnfication and quality of scope

3) conditions

4) stability of optic

5) experience

 

There r 2 reasons why scope magnification is important. It allows u to more accurately define the tgt. edges to allow for a more accurate interpolation between stadia, and it can help with approximating the relative size of game (older animals tend to be bigger than younger ones), allowing the "ranger" to adjust for the size of the animal. If you're using a 2nd focal plane optic that mil-ranges @ 10X, but adjusts to 20X, then i would suggest "mil-ranging" at 20X, and double the reading (once u've confirmed that 20X is actually 1/2 of 3.6 inch per hundred yds.), for the above-stated reasons, as well as it gives u a more accurate reading since it doubles the interpolative accuracy (1/10th 3.6inch per hundred yds.= .36 IPHY---- 1/10th 1.8 IPHY= .18 IPHY). By working the mil-ranging formula backwards (reverse milling) u can get an idea of the accuracy of the system. Here's the equations for a 500 yd. 11" coyote using the std. mil subtension of 3.6IPHY--

 

11 x 100 / 3.6 / x = 500 yds.

 

x=0.6 mil reading

 

If the coyote is actually 10 inches, and he brackets right @ .6 mil here's the calculated error--

 

10 x 100 / 3.6 / .6 = 463 yds. This amts to a little less than 10% ranging error, but in this scenario a miss would occur. The biggest problem with reticle-ranging is that as range increases the inaccuracy becomes geometrically greater. But it is better than guessing, and will flat amaze u at how accurate it can be on hard tgts.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/18/2006 at 10:55
ba_50 View Drop Down
Optics Apprentice
Optics Apprentice


Joined: December/02/2004
Location: Illinois
Status: Offline
Points: 150

I haven't bought a scope yet as I am waiting to see how much the SS variable will cost.

 

True, the MD is better than nothing. It is also hard the define any dimensions by guessing, even the military has to do that.

 

The trouble with coyotes is they don't linger long if I can get them coming.

 

I will look at yours calcs more closely.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/19/2006 at 02:19
sscoyote View Drop Down
Optics Journeyman
Optics Journeyman


Joined: October/05/2004
Status: Offline
Points: 325

I get ya' on the moving coyote thing. I'm a spot and stalk hunter these days, and have a lot of long-range opportunities handed to me. My most recent rig is an XP-100 handgun in 6.5 WSM, that i will use for long-range sniping. I put Leupold's 8.5-25X Mk 4 on top. It has the new Tactical Milling Reticle in it with the .2 mil stadia. Oughtta provide .02 mil interpolative accuracy. Looking forward to trying it out on coyotes.

 

I also use plex, and ballistic reticles for "mil-ranging" by simply substituting the stadia subtensions into the mil-ranging formula where the 3.6" figure is. Works great for ranging, and in fact the simple plex is 1 of the best 3 stadia ranging reticles going, IMO.

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