MOA/Mills???

Discussion in 'The Basics, Starting Out' started by ShooterMedic, Feb 20, 2010.

  1. ShooterMedic

    ShooterMedic Well-Known Member

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    So here is what I know, I shoot a mil dot scope and 1 mil = 3.4 MOA at 100 yards wich also equals 3.6 inches more or less at 100 yards Correct??

    My questions is does that relationship change at 200 yds the same way that 1 MOA at 200 equals 2 inches and 1 at MOA is 300 yds is 3 inches, wherefore does 1 mil at 300 yds equal 10.8 inches?

    My question spurs from a hunting situation I had yesterday with a coyote I new his distances was 429 yds and i did not have time to adjust my MOA so I used hold over with my mils I just was not sure if I was doing it right. Yes I missed the coyote. I shot high about 6 inches according to my spotter.


    Thanks for your help.:)
     
  2. Ridge Runner

    Ridge Runner Well-Known Member

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    3.6 @100, 7.2@200, 9" @250, 18" @500, 36"@1K, yep your gettin it
    RR
     

  3. sscoyote

    sscoyote Well-Known Member

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    I'm gonna assume you were about 18" low at 430 yds. assuming an avg. trajectory. That's 4.2 SMOA (18/4.3). 4.2/3.6 = 1.2 mil holdover.

    Assuming this trajectory to be ~correct (and assuming u were at the correct magnification for the mil subtensions to be correct at 3.6 IPHY) and u hit 6" high at 430 yds. then u're off by 0.4 mil (6/4.3/3.6=0.4).

    Remember though--these calcs aren't done in the field. All this should be calcd. beforehand and put someplace for quick reference. Almost every ballistics program has drop in mils these days, so u don't often even have to calculate it.
     
  4. ShooterMedic

    ShooterMedic Well-Known Member

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    Thanks for your help. I am shooting a 223 WSSM at 3880 FPS. I have made up a MOA range card just from the Hornady web site. But it does not have Mils as an option.
    What Balistics program do you guys use and how much is it? do you use it on like a palm pilot or on a smart phone?

    Thanks
     
  5. Ridge Runner

    Ridge Runner Well-Known Member

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    I run exbal on a palm zire
    RR
     
  6. sscoyote

    sscoyote Well-Known Member

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    I use Exbal too RR, on an old Palm system--but there r freebies out there too, somehwere.

    Here's my dope and system for a different reticle, very quickly referenced--

    [​IMG]
     
    Last edited: Feb 21, 2010
  7. ShooterMedic

    ShooterMedic Well-Known Member

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    That is really cool, sorry this may be a dumb question but how does that system work? and what reticle is that for?

    Thanks
     
  8. bigsteve

    bigsteve Active Member

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    If you have an IPhone or IPod touch there are a handful of ballistic applications that work pretty well also. If you are interested in reading a good write up on Mil/MOA http://www.usoptics.com/index.php?page=faq this link will give you a very good explanation...along with formulas for ranging.

    Steve
     
  9. CA48

    CA48 Well-Known Member

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    Here is a real simple form. to figure out mil value at any range

    Range x 36 = mil value in inches

    ex. .300 x 36 = 10.8 .522 x 36 = 18.8 1.200 x 36 = 43.2
     
  10. sscoyote

    sscoyote Well-Known Member

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    Medic--that dope u see is for my 65 SGK load out of my AR-15 using this TK Lee reticle--

    [​IMG]

    It's a 3 MOA system between dots and 4 MOA windage. Just run the ballistics program and calculate the drop and windage in MOA. For example if say the drop for 450 yds. is 5.0 MOA then that's 2 MOA more than the 1st dot, and since there is 3 MOA between dots then 2/3=0.7. So the dope would be 1.7. Then calculate windage the same. See how it works?
     
    Last edited: Mar 11, 2010
  11. xdeano

    xdeano Well-Known Member

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    I picked up a Palm Zire 72 off ebay for cheap and stuck the Pejsa program on there. It is unbelievable how accurate it is.

    the whole setup cost me around $65 or so.

    I do the same this as you sscoyote, flip cap ballistics for quick adjustments.

    xdeano
     
  12. Lead_Farmer

    Lead_Farmer Active Member

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    Hey i am not trying to hi jack the thread but i want to know how do you use mill dots and what are MOAs exactly.