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Thread: 5.56 vs. .223 chamber image source

  1. #1
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    5.56 vs. .223 chamber image source

    Does anyone know the original source for this image?


    I've seen it in so many places and for so long on the web that I am not sure where it first appeared. I believe it came from http://www.saami.org/unsafe3.htm but that link is no longer active. IIRC that page had a detailed description of pressures etc. to outline the differences.

    I'd like to find the actual, original, source for the above image, or an alternate source that has the same specs for chamber dimensions such that I could make my own version of the above and give proper credit.

  2. #2
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    I don't know the source you have but Randall of www.ar15barrels.com has some good chamber .223/5.56mm NATO info on his site:

    http://www.ar15barrels.com/data/223vs556.pdf

    http://www.ar15barrels.com/data/223-556.pdf
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  3. #3
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    Thanks Robb.

    BTW, sent you an email earlier this morning on a somewhat related matter.

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    ammo-oracle.com
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  5. #5
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    Quote Originally Posted by Frens View Post
    ammo-oracle.com
    Yeah, but they got it from somewhere else first. They didn't make that image.

  6. #6
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    The September issue of SWAT Magazine will have an article by me on this subject. There should be a pretty good picture of two pieces of barrel, sectioned, one chambered in .223 and one in 5.56 NATO.

    In the article I also do a little accuracy testing-- in a Sabre heavy target/varmint barrel with a .223 chamber. I do some grouping before and after reaming to 5.56.

  7. #7
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    my understanding is that a 5.56 chambering is generally less accurate than a 223 chambering when shooting 223 ammo

    thoughts?

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    Quote Originally Posted by ccoker View Post
    my understanding is that a 5.56 chambering is generally less accurate than a 223 chambering when shooting 223 ammo

    thoughts?
    That's the prevailing consensus, yes.
    Best Regards,
    28_days

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    And when the day arrives that I can outshoot my carbine from real world working positions and conditions, I shall commence to worrying about that horrible loss of accuracy from shooting a 5.56 NATO chamber!

  10. #10
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    I ask because I use mine for more than just tactical stuff and wanting tight groups on paper and for varmint hunting...

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