Got a mil/mil scope coming in so I figured I may as well learn metric. But oh man... It's a long process having to rewire my brain for it.

Do you guys range in meters or yards and use something like the mildotmaster to convert?

What about windage? mph still?

You don't really have to embrace metric measurements to use a mil rad scope.  



Granted .1 milrad is 1 cm. @100 meters, but it you can also think of it as .36 inches at 100 yds.  



1 milrad is 3.6" @100 yds, 18" @500 yds, 36" @1000 yards.



I do use a mildot master for ranging targets with a laminated sheet hanging from the scope with my come ups in 50 yd. increments.



Wind I do full value, half value, quarter value. so mph it is.  



If that's confusing, here's a quick link http://info.sightron.com/downloads/Mil-Radian%20System%20Intructions.pdf

yards / mph

Yards and mph.  I started with MOA and everything about mils is much easier.

OP, the easiest (in my opinion) equation to work with is L = r * theta, where theta is in radians. Reference. The shooter is at the center of the circle, aiming at a target on the circumference. Radius is the distance from the shooter to the target. Arc length is the height of the target.

I also know the equation as s = r * theta. When theta = 0.001 radians, or 1 milliradian, then: s = distance to target * 0.001 radians.

@100 yds (3600 inches), arc subtended  = 3.6 inches.
@200 yds (7200 inches), arc subtended  = 7.2 inches.
@500 yds (18,000 inches), arc subtended = 18 inches = 0.5 yard.
@1000 yds  arc subtended = 1 yard.

@100 meters, arc subtended = 0.1 meter.
@200 meters, arc subtended = 0.2 meter.
@500 meters, arc subtended = 0.5 meter.
@1000 meters, arc subtended = 1 meter.

I think it is easier to work in inches and yards for no other reason than I am culturally accustomed to it. For quick mental math, think in terms of multiples of 100 yards, where the arc at one milliradian is 3.6". At 670 yards, the arc subtended would be 6.7 * 3.6" = 24.12". My mil/mil scope accommodates it just fine.

If the milliradians number is increasing, then the target size is increasing. For two mils:

@100 yds (3600 inches), arc subtended  = 7.2 inches. (3600" * 0.002)

OP, you will eventually come across a suite of equations to calculate range to targets depending on the type of reticle being used. See Linden Sisk's web site

This is the one that I stick with for my MRAD scopes:



Example when object is 50" and measures 2.5 mils in scope: (50" / 2.5 mils) x 27.77 = 555.4 yards

~BUT~ I have my own simplification based on my previous post above, using 3.6" as the constant that relates inches to mils. Of course the purists will say it is non-standard, but 3.6 inches is easier to work with than a constant of 27.77.

(Height of Target (Inches) / 3.6") / Image Size(mils) = Distance to Target(100 Yards)



Example when object  is 50" and measures 2.5 mils in scope: (50" / 3.6") / 2.5 = 5.55 hundred yards



I just think it's easier on my calculator, and it does lend itself to some quick mental math for certain estimations. Such as:

If the target is conveniently 18" or 36", then 18/3.6 = 5, and 36/3.6 = 10. Then the math is simply 5/mils or 10/mils. If the target is relatively close to 9", 18", 27", 36", 45", etc., then the (target"/3.6") constant becomes convenient for quick mental estimates.

MRADS are not metric. I use yards.



yards x 1000
----------------- = range in yards
    MRAD


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yards/MPH

mil/mil yards mph

In the US, GB and 2 or 3 more countries yards inches and mph. Rest of the planet, metric. It is just which system you are more comfortable with.

other than ranging you could try to stop thinking of corrections in length across the target face in inches or cm.  Think of them as angles which they are.

I say that but old habits and all that.

... Yards

This.

Same...

I use both, depending on what system my students are using. It's not uncommon for me to have foreign students, such as Israelis, in my classes, so I'll use meters with them. For most of my American students I use yards, unless they want meters.

Why do so many folks think mils are metric? Is it because they're usually divided into .1 increments?

Probably.

Because they are.

Keep in mind the term "metric system" is outdated. "SI" is the term now used (International System of Units), and Radians are an SI derived unit and uses all base10 pre/post fixes. Degrees would be the legacy non base-10 system. Oddly, Degrees is also acceptable in the SI system, adding more confusion.

https://en.wikipedia.org/wiki/International_System_of_Units

I use yards. I also use MOA.

for my AR shooting 100-500m regularly, I use a MarkAR 3-9 MIL dot, with MIL clicks, and MPH wind for dope. This is my first ever "precision" rig and I will probably never go back to MOA ever again. This setup allowed me to become proficient as a steel shooter at distances.

I work with SI units every day, so switching back and forth between standard and SI is no big deal. I prefer meters for range and mph for wind speed.

I just mentally convert between the two whenever my weapon requires it.

It's not hard at all.

LF

Use meters to keep everything simple. That is what we use in the military.

Both.  It's just math.

Example:  500 Meters = 550 yards.  Covers most of your bases.

Mils/meters/mph

It is no more metric or SI or imperial than an hour or a minute for our uses, it can be used interchangeably without any conversion. I can use mrads with yards and meters equally as well unlike when using imperial and metric together in a formula. An angular measurement can be used with any linear measurement whether it is inches, meters, miles, parsecs, beer bottles or car lengths. You don't have to convert yards to meters to use mils and you don't have to convert meters to feet to use degrees(moa).

It is plain as day it doesn't matter whether you use yards or meters with mils when you use the formulas, either works.