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Looking for Answers regarding TMR/mil formula 
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sscoyote
Optics Journeyman Joined: October/05/2004 Status: Offline Points: 327 
Exactly. I also don't see how the math would work for 2 different unknowns in the same equation unless this guy would approximate range with the eye. It's very accurate to rangefind with the turret assuming the gun is steady since u could theoretically divide a .25 MOA, IPHY, whatever the unit into tenths, from the very last click that takes u above the target. This would give a rangefinding accuracy level of ~ .025 MOA, etc.
I've worked a lot with the milranging formula. The most important aspect of rangefinding with any reticle is the flexibility of the milranging formula, NOT IT'S APPLICATION TO THE MILLIRADIAN UNIT OF MEASURE! As it turns out it's most basic form defines not only rangefinding with any reticle/turret but also downrange zeroing as well. Here it is copied from another forum
It's all based on the most basic form of the milranging formula, because a bullet drop at any distance is the same sort of dimension as a target size when referenced with an optic (turrets or reticle). Any other formula given will be a simplification or rearrangement of this
bullet drop (") x range of reticle subtension or turret value measurement (usually 100 yds.) / reticle or turret subtension (") / "milreading" or turret clicks (decimal equivalent) = range (yds.) Looks complicated, supersimple to apply. Hows about 10" low at 400 yds. with 0.25" per hundred yd. turret clicks as OP suggests. 10 x 100 / 0.25 / X = 400 X=10 clicks Now if u have a turret that's graduated in 1.0 inch per hundred yd. numbers then 10x100/1.0/X=400 X=2.5 whole # graduations. Repeating interval reticles (rangefinding reticles mostly) are the same way and ballistic reticles require 1 more calculation to get the dope. Rangefinding with reticles is the exact same system just replace bullet drop with tgt. size ("). This time range is the unknown once the "milreading" (or even turret click) is determined. Now simplify and/or rearrange as desired. When i use the TMR reticle for rangefinding i use a factor of 138.9, since i'm attempting the highest degree of rangefinding accuracy for every reticle i use. 138.9 comes from 100 yds./0.72" since that's the subtension between each .2 mil. (actually i even go further by subtracting 1 line thickness since interpolating between line stadia will be more accurate this wayjust a theory of mine and Darrell Holland's. Certainly easy to prove if i ever get the time). Too many guys use the TMR incorrectly, and they try to use it to interpolate (guessing the milreading between stadia points) only to a level of 0.1 mil. Interpolating to a level of .02 mil is WAY more accurate. Suppose there is a 10" target that occupies 3.4, .2 mil TMR units. Then here it is
10 x 100 / .72 / 3.4 = 410 yds.
You MUST understand this formula backwards and forwards (i have committed it to memory) and apply it with every multistadia reticle i use for rangefinding from simple plex to mildot to Ballistic Plex. It's very easy to calculate tgt. size from known range and tgt. size "reverse milling". There is 1 additional calculation for rangefinding with a multistadia reticle that doesn't repeat it's subtension (ballistic reticles). Here's a link to rangefinding using the milranging formula with any reticle www.ottllc.com/specialtypistols/sp20.pdf (Item CReticle Rangefinding).
Hope this helps some.

Steve

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Rancid Coolaid
Optics Jedi Master Joined: January/19/2005 Location: United States Status: Offline Points: 7804 
Exact.
Dammit! There's one in every crowd. 
The plural of "anecdote" is not "data."

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8shots
Optics Jedi Knight Lord Of The Flies Joined: March/14/2007 Location: South Africa Status: Offline Points: 5811 

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Graysteel
Optics Apprentice Joined: October/02/2007 Location: United States Status: Offline Points: 200 
My concern is that Mac who is currently trying to apply this theory in an unfriendly environment understands why folks are saying that it cannot be done.
The issue is that in this case you simply do not have enough data to solve the problem. While there are ways to solve for both an unknown distance and an unknown object height, they all require more data. Either you have to have two millings of the object from two different distances and know the delta between the distances or you can triangulate distance if you have a very accurate vector from two points. Both cases require additional information. Triangulation can be useful if you have two different LP/OPs or hides that have communication between them. 

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