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Thread: Sighting a rifle scope at 25 yards for 100 yards

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    Sighting a rifle scope at 25 yards for 100 yards

    I have a an m4 style AR15 with a 16" barrel and I'm trying to sight it in. The biggest range around where I live is only 25 yards. To achieve a 100 yards zero, how high should the POI be from the POA?

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    With a 100y Z your point of impact will be about 1.5" low @ 25y.
    Adjust your sight so that you are hitting 1.5" below your POA.


    About like this:


    * This is a 50y Zero shot at 25. My AR now sports a 100yZ but I don't have a POA/POI pic for that.
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    Last edited by AMMOTECH; 01-17-12 at 16:15.
    -David


    USAF 1987-2008 {461/2W0 Munitions Tech}
    FN Mfg. 2008-???? http://www.fnmfg.com/

    AR-15 owner/shooter since 1998

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    1.5" low, if you search around on here I know there are printable targets for doing just this

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    http://www.m4carbine.net/showthread.php?p=1176195
    These are the ones I used. Just click on the one you need and print it out.

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    Quote Originally Posted by AMMOTECH View Post
    With a 100y Z your point of impact will be about 1.5" low @ 25y.
    Adjust your sight so that you are hitting 1.5" below your POA.
    I'm thinking out loud here. Obviously when you zero your optic at 25 for 100 you need to actually verify your 100 yard zero. Okay, given.

    If you "tweak" this just right, is there a possibility that your 25 for 100 zero means that at 25 you put your red dot on the target, so that at 100 yards you would aim the red dot just under the target?

    This kind of stuff makes my head hurt, but it occurred to me in the real world how handy that would be.
    W.I. Thomas: "If men define situations as real, they are real in their consequences".

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    Quote Originally Posted by Doc Glockster View Post
    I'm thinking out loud here. Obviously when you zero your optic at 25 for 100 you need to actually verify your 100 yard zero. Okay, given.

    If you "tweak" this just right, is there a possibility that your 25 for 100 zero means that at 25 you put your red dot on the target, so that at 100 yards you would aim the red dot just under the target?

    This kind of stuff makes my head hurt, but it occurred to me in the real world how handy that would be.
    Yes always verify at distance.

    @100y with 100y zero you just hold on the center of the target. As the target distance becomes shorter you hold(aim) higher.
    In my pic above I was aiming at the red dot. If I had wanted to hit the red dot I would have had to held over or aimed higher.

    Did this help? Did I get it right....

    .
    .

    .
    Last edited by AMMOTECH; 01-17-12 at 17:43.
    -David


    USAF 1987-2008 {461/2W0 Munitions Tech}
    FN Mfg. 2008-???? http://www.fnmfg.com/

    AR-15 owner/shooter since 1998

    .

  7. #7
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    At 25 yards your point of impact should be approximately 1.5 inches below your point of aim. The point of aim needs to be consistent so that your adjustments are based off of a real hold, not an approximation.
    At 100 you will be establishing POA/POI convergence, as in: the bullets will hit where your sighting system is pointing. This is a 100 meter/yard zero.

    "Zero" does not have to mean POA/POI, but it is usually applied that way.
    Jack Leuba
    Military/Government Product Liaison
    Knight's Armament Company
    jleuba@knightarmco.com

    Director of Training

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    As accurate as needed, as fast as possible, as many times as it takes.

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