GUN Zero'ing AR

Discussion in 'On Topic' started by Didact, May 20, 2008.

  1. Didact

    Didact I have no idea what I'm doing

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    Just out of curiousity, how far out is everyone zero'ing their AR?

    [​IMG]
     
  2. Soybomb

    Soybomb New Member

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  3. ShackleMeNot

    ShackleMeNot MINDSET

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    It would suck to be blind in one or both eyes. At least you'd still be able to hear which is OK I guess.

    Use a 50 yard zero on your AR unless you have a good reason not to.
     
  4. Didact

    Didact I have no idea what I'm doing

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    :eek3: I just realized I shot all afternoon without them.

    Ok, I'm a dumbass.
     
  5. P07r0457

    P07r0457 New Member

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    your stock is extended a wee bit far. I zero'd mine at 100 yards because of the flat-trajectory of .223 and I can't imagine using it further out than that. They're building a 200 and 300 yard range near me, so I may re-zero at 200 yards. I believe that is the recommended distance by the military. Actually if I ever need it for HD it'd be much closer than that.
     
  6. Soybomb

    Soybomb New Member

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    100 yard zero
    [​IMG]

    50 meters
    [​IMG]

    300 meters
    [​IMG]

    To each his own.
     
  7. yar1182

    yar1182 New Member

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    These are generalzations and you will have to confirm with your rifle and with your ammo.

    Say you have a 16" barrel AR shooting 55 grain 223/5.56 which makes about 3000 fps in your barrel. Your iron sights are 2.6" above bore.

    If you zero at 50 yards would will also be zero'ed at 220 yards. One zero is for the bullet flight up, and the other is for the fight down. This would probably be the best zero for most people w/ 55's.

    So here is your hold overs...

    25 yards 1" low
    50 yards zero
    75 yards 1" high
    100 yards 1.5" high
    125 yards 1.8" high
    150 yards 1.8" high
    200 yards .75" high
    225 yards .32" low
    250 yards 1.8" low
    275 yards 3.75" low
    300 yards 6" low
    325 yards 9" low
    350 12.32" low
    375 yards 16.25" low
    400 yards 20.75" low

    Now you have to confirm so that means check the data for your ammo, chrongraph your ammo in your gun, measure your height over bore and plug the data in balistic software. Then shoot the gun at various ranges to confirm.

    or for less anal retentive people (aka everyone not like yar). zero at 50, see if you can hit stuff holding dead on at 200 - 225 then guess-timate your hold overs off of that.
     
    Last edited: May 21, 2008
  8. Didact

    Didact I have no idea what I'm doing

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    :eek3:

    Ok, I'm using a MI flip up BUIS and the standard front post. BUIS adjust left/right and the center front post is elevation (need tool?)
     
  9. yar1182

    yar1182 New Member

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    55 grain is weak sauce for extended 223 range. I like the 69's or 77's. One of the great thing about running two optics is that I can set one up for 69's out to 400 yards and set one up for 55's under 100 yards.
     
  10. McCroskey

    McCroskey Jonny, what can you make out of this? OT Supporter

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    :bigthumb:
     
  11. Tdizzle

    Tdizzle New Member

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    I did mine at 50 yards, but a side note I find its easier to either feed in each round or use a 5 round magazine when zeroing, having the large magazine and grip on makes things a bit unstable. Good sandbag is always a large plus as well.
     
  12. Soybomb

    Soybomb New Member

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    Have you tried all of the heavy options (75 gr hornady, 77 sierra, 77 nosler)?
     
  13. yar1182

    yar1182 New Member

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    I've tried a good variety. Some things to consider I'm shooting a 18" 1x8 twist. The barrel shoots SMK 77's the best but they are much more expensive than the 69's. I sometimes shoot the 65's and 62's when I can get them at a good price. I try to stay with the 69's as my load is very similar to the black hills 69's. In a pinch I can go with this. Say I run out of ammo at a match I know buy, borrow, or steal some BH 69's
     
  14. ZCP M3

    ZCP M3 Active Member

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    subscribed for later.
     
  15. mauk

    mauk OT Supporter

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    i did ~100 yards, but its pretty close at 50
     
  16. yar1182

    yar1182 New Member

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    Still need to confirm as I just rebarreled, JP lightweight 18" 1x8 twist shooting 26g of varget behind a 69 grain SMK (2900 fps zeroed at 35 yards, scope height over bore 3".)


    25 yards .75 low
    35 yards zero
    75 yards 2.75" high
    100 yards 4" high
    125 yards 5" high
    150 yards 5.75" high
    175 yards 6.25" high
    200 yards 6.25" high
    225 yards 6" high
    250 yards 5" high
    275 yards 4" high
    300 yards 2.5" high
    325 yards zero
    350 yards 2" low
    375 yards 5" low
    400 yards 9" low

    From my evaluation it's hitting a little lower than the balistic software calculates. I'm thinking if I correct to a 33 or 30 yard zero the POI will match the 35 yard zero calculations. Once I've confirmed I'll make new charts and work on commiting them to memory.

    For my 3 gun matches we are shooting 8" plates with the far shot out to 355 yards, average long range shot 220 to 300. Every once in a while we see a 400 yard shot. So I'm holding bottom of the plate until I get out to 300 where I hold center of the plate. Anything past our normal 355 yards I'm holding top edge or just over the plate.
     
    Last edited: May 21, 2008
  17. Hooch

    Hooch New Member

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    35 meters always
     

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