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Thread: Proper sight in distance for .223

  1. #1

    Proper sight in distance for .223

    Im trying to figure out how far I should sight in my rifle

    I have a colt ar15 Hbar
    My current set up it with an acog on the flat top upper.
    I have become interested in shooting further distances with higher magnification, however I have little experience with this.

    Recently, I put on a magpul precision adjustable stock and this scope that my father has had laying around unused for awhile now. This scope has a variable zoom from 3x to 10x magnification.

    So my question is if there is any standard distance that most people sight in a scope for .223?
    and if anyone knows some of the ballistics associate with it? such as when the bullet goes past the initial zero, what distance will it then return to zero? Also, how high does the bullet reach at its peak between the two zeros?

    I've looked around online trying to do some research but really haven't found anything yet that is straight forward in its explanation.

    Thanks everybody
    Jono

  2. #2
    Total devotee waterdogs's Avatar
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    A lot depends on the rate of twist for that particular barrel, and the ammo being used. A lot of those (older) HBARs were 1:10 or 1:12 twist....not ideal when paired up with today`s heavier ammo. A 1:7 or 1:9 would be more suitable for bullets in the 62-68 gr. range.
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  3. #3
    This particular barrel is 16" with a 1:9" twist
    all the .223 ammo I have is .55gr

  4. #4
    The best summary I've found:

    http://www.lawofficer.com/article/ma.../long-gun-zero

    There are links at the bottom to download the target and ballistics chart.
    Last edited by stdlrf11; 02-15-2011 at 06:58 PM. Reason: punctuation


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  5. #5
    Good Link

  6. #6
    I would zero at 200 meter and know your dope for all other ranges. There are plenty of ballistic programs that will tell you trajectory for a given load and scope height. But you really need to build your own data.

  7. #7
    Quote Originally Posted by stdlrf11 View Post
    The best summary I've found:

    http://www.lawofficer.com/article/ma.../long-gun-zero

    There are links at the bottom to download the target and ballistics chart.
    Thanks a lot. Great link.
    Im going to sight in at 50 yards so it re-crosses at 200 yards.
    And the trajectory is pretty flat through there so I should be good to go.

    Thanks again that link really helped me out

  8. #8
    Stabber's Steel Connection Stabber's Avatar
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    Hmm, i thought it was 75/150
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    Former Village People Roadie Parker's Avatar
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    Sight in at 25 yds, then move it to 100 zero.

    You "should" be close to zero at 25, half an inch high at 50, back on center at 100. Or it may be zero at 200, an inch high at 100. if you can hit like this at 100 or 200 yards with irons, you're better than any of us!

    YMMV if course.

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    Cathar Knight RoadFish's Avatar
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    Am I missing something? You say that you are interested in shooting at longer distances. I would zero the rifle at the distance that I am going to be shooting at the most often with the ammo that I am going to be using. You can then work back to see where you are hitting at shorter distances, or work out farther shooting at targets at longer distances to see where you are hitting. There is no theoretical magic better than actual range work with the weapon and its ammo.
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  11. #11
    Thanks for the link. The rationale in the article makes sense to me.
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    Beware The Ides of March GEEZER's Avatar
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    Quote Originally Posted by RoadFish View Post
    Am I missing something? You say that you are interested in shooting at longer distances. I would zero the rifle at the distance that I am going to be shooting at the most often with the ammo that I am going to be using. You can then work back to see where you are hitting at shorter distances, or work out farther shooting at targets at longer distances to see where you are hitting. There is no theoretical magic better than actual range work with the weapon and its ammo.
    X2.. The whole point of zero @ 25 yards is to get on paper and save ammo. It is a matter of preference as to your final zero distance. I have my final zero @ 150 yards. This makes me 1 inch high @ 100. (or there abouts). I mostly use the .223 for shorter varmit shots, after 150 yards, I use the .22-250 or the .204 Ruger.
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  13. #13
    Stabber's Steel Connection Stabber's Avatar
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    Right Parker. I forgot the Formula

    25 & 100= Same POI

    I had a Ballistics chart but Can not find it. Remington used to Give them out if you asked

    Geezer, your 223 is Sufficient to 500yds. 150 is a cake walk for it
    Last edited by Stabber; 02-16-2011 at 01:14 PM.
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    Total devotee waterdogs's Avatar
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    What you *should* be concerned with is "Maximum Point Blank Range", which is *completely* removed from the commonly-percieved (and incorrect) notion of "Point Blank", which most people think means like 3 feet away.

    This explains the concept in clear & simple terms:

    http://www.rmvh.com/MPBR.htm
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  15. #15
    Quote Originally Posted by waterdogs View Post
    What you *should* be concerned with is "Maximum Point Blank Range", which is *completely* removed from the commonly-percieved (and incorrect) notion of "Point Blank", which most people think means like 3 feet away.

    This explains the concept in clear & simple terms:

    http://www.rmvh.com/MPBR.htm
    Very interesting!

    Thanks.


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