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Mil-Dot Range Finder iPad App....help needed

Discussion in 'Anything Airgun Related' started by Dag, Mar 27, 2014.

  1. Dag

    Dag Pro Poster

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    Has anyone downloaded this free app to their iPad or other device if applicable? I only ask 'cos on the face of it it looked a neat way of determining distances from scope to target.
    However on testing it this morning i set up an A4 sheet of paper (11.25" high) approx 15yds away and looked through my scope which I had set at 4x. I noted that 8 mildots covered the height of the target and keyed that into the app. On hitting the button to give me the range it showed 38yds! :eek:
    I'm pretty ignorant of U.S. reticules and this app seems to have U.S military versions so I had selected what seemed to be exactly the same as my Hawke scope which has 5 mildots on each branch of the reticule. Obviously something is vastly different though to give such a wide variation.
    Has anyone else tried it and succeeded where I have failed. It's more an academic exercise as I can't see myself using an ipad whilst out shooting but I'd like to understand mildots and rangefinding a bit more than I do now.
    Thanks for any suggestions ( other than the inevitable "Forget it and just practice" )
    Dag :confused:
     
  2. 759674423

    759674423 Engaging Member

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    I haven't seen the app but I guess you should have the mag on x10 for it to calculate accurately.
    Maybe give that a go?
     
  3. imorik

    imorik Busy Member

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  4. terry1001

    terry1001 Major Poster

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    Mil dots are only correct at one specific magnification setting, this is usually 10x. Of course if you set your scope to 10 you won't know if the scale is accurate so the mil dots might still be wrong.
    If you correct your calculations to 10x by dividing 38 yards by 2.5 you come up with 15.2 yards.
    There are some you tube videos on this subject but for the method to be of any use you need to know what magnification your scope is set at and you also need to know the size of the target. If you like to keep changing your zoom or can't tell a 3/4 grown rabbit from a full grown one etc then it's pretty well useless.
    Your best bet is to spend time and effort estimating ranges, set your scope on a usable zoom setting (and leave it there) and then work out which mil dot corresponds to what range. If you spend some time with Chairgun Pro you can get a good idea od the holdovers required and if you know your pellet and the muzzle velocity you may well be able to find a zero range and magnification setting which will make the holdovers simpler to use and remember, if all else fails you can print off a chart to go in your scope cap or a range card to tape to the stock etc.
     
  5. Dag

    Dag Pro Poster

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    Three excellent responses. Many thanks chaps. I have a lot to learn about mildots and rangefinding. Of course at a short distance like 15 yds I'm going to find it difficult to get a sheet of A4 in the scope at 10x but I'll play around with smaller objects.
    I love playing around with Chairgun so will spend more time with that and testing the app imorik suggests ( it looks much better at first glance). Anyway, thanks again all of you!
    Dag:)
    ps I should have said it was the fact that mildots are correct at 10x only that I was missing.
     
    Last edited: Mar 27, 2014

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