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please school me on scopes with "Mil" based adjustments

Discussion in 'Shooting Gear and Storage' started by Detritus, Nov 15, 2012.

  1. Detritus

    Detritus Well-Known Member

    having just discovered that the scope my wife has indicated she wants for her new rifle, as well as the rest of the scopes of the same brand with MOA based turret adjustments, has been removed from the lineup. no mention of why, or if they'll return to the lineup after a revamp or are permanently bye bye, they're just gone and the newer line with "mil" based adjustments remains.
    In 16 years of shooting target rifles I've never used a scope that didn't have MOA based adjustments, so i know next to nothing about "Mils" in relation to scope adjustments.

    So can someone please eitehr give me a short clear run down on what a 1/10th of a mil translates to on target at various ranges or a link to said info. I need to figure out if this is gonna be a pain in my rear to deal or if it's simply a change in value(s) that i can say Each click = this much easily explainable change in POI.

    I figure if it turns out SWMBO wants the Mil based scope I'llhave to buy one as well. maybe good maybe bad don't know.

    anyway thatnk yo or your time and any info you care to share, it is appreciated.
  2. marinetowgunner

    marinetowgunner Well-Known Member

    1/10 mil = .36".....x2 for 200 = .72"....x3 for 300 = 1.08.........that's how I figure it.

    Might want to look into a ballistic app to make life easier. I have Ballistic AE and Bullet flight on my iphone. You can run your dope chart in MIL or MOA and get click values for your dope.
  3. Detritus

    Detritus Well-Known Member

    Ok cool, i'll keep that in mind. and will probably need/use the info in a few months when i upgrade my own scope.

    seems that the incident that lead me to post this (the disappearence of the scope wife wants from SWFA's website) was a false alarm. they're back where they belong now so it's not so urgent.

    and frankly for teaching someone new to target type rifles, i'd rather stick with the adjustment system i Know than have to learn how to deal with a new one.

    thank you, the info helps my understanding.
  4. taliv

    taliv Moderator

    a "mil" is simply an angular unit of measure like MOA that is based on 1000. so,
    1" at 1000" = 1 mil
    1' at 1000' = 1 mil
    1 yard at 1000 yards = 1 mil
    1 meter at 1000 meters = 1 mil
    same for leagues, parsecs, microns or any other unit of length

    since it is angular... if 1 yard at 1000 yards = 1 mil,
    then if you convert that yard to 36" and divide both by ten, then 3.6" at 100 yards is 1 mil
    and if your scope knobs are 1/10th mil per click, then you want to divide by 10 again, so .36" at 100 yards = 1/10th mil
  5. MachIVshooter

    MachIVshooter Well-Known Member

    It's still good to understand the other unit.

    Radians are the SI measurement for angles, and like everything metric, are easier to convert back and forth.

    We're used to degrees, minutes and seconds here in the USA, and it's even easier for us because 1" @ 100 yards and 2" at 200 yards and so on closely approximates MOA. But real quick like, try to convert a .64 MOA 936 foot group into an inch measurement...........OK, let's see, one MOA is 1.047 inches at 100 yards, multiply by 9.36, divide by 3..........

    With radians, the conversion is much simpler. a .21 Mil group is .21 of 1/1000 the distance. So if you're shooting at 100 meters, 1 mil is one decimeter, and .21 mil is 2.1 centimeters.

    And just for those who "know" what a mil (or mil dot) is but don't really know, a mil (milliradian) is 1/1000 of a radian. A radian is a section of circumference equal to radius. There are 2*pie radians in a circle (~6.28).
  6. Detritus

    Detritus Well-Known Member

    Oh, it's very likely that I'll eventually buy a Mil based scope to play with and possibly convert to, and wind up converting the wife as well. since it seems to be an easier system to use once you've learned/adapted to it.

    At this point though, since I am going to be providing the instruction/coaching for a person who is new to shooting 100+, I beleive it will be easier and smoother for the both of us, to be using a system that I already "know".

    I want to avoid any bumps in the road that could come from me trying to learn a new system while trying to teach someone else the basics. You know, lot easier to have this conversation (least in the US)
    shooter: It's off to the Right.
    coach: How far?
    shooter: 2 inches
    Coach: Well we're at 100yrds so that scope has what amounts to 1/4" per click adjustments, so...
    Shooter: 8 Clicks left?
    Coach: Correct

    than to have the same convo but with the coach having to go, "Let me check my notes" in the middle of it
    Last edited: Nov 16, 2012

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