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Thread: 5.56mm NATO versus 223 Remington Chamber Differences

  1. #11
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    Awesome and informative post Molon!!

  2. #12
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    Thumbs up

    New to the site. Good thread!! Thanks for the info.

  3. #13
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    Tagged....

    Thanks, Molon!!

  4. #14
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    also...one should keep in mind that once fired in a 5.56 chamber, the .223 is 'fire-formed' to the 5.56. that in turn alters the water capacity of the case...ever so slightly, but the brass should be kept separate for re-loading purposes.

    different primers and a 'hot' load could result in a spike in pressure.

  5. #15
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    Quote Originally Posted by donwalk View Post
    also...one should keep in mind that once fired in a 5.56 chamber, the .223 is 'fire-formed' to the 5.56. that in turn alters the water capacity of the case...ever so slightly, but the brass should be kept separate for re-loading purposes.

    different primers and a 'hot' load could result in a spike in pressure.
    Huh? Chamber dimensions are THE SAME. The cases don't touch the leade which is where the two differ.
    "You people have too much time on your hands." - scottryan

  6. #16
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    i saw an article and diagram, where the case shoulders differ slightly in angle.

    at the moment i cannot recall...i will research the article and see if i can recover it. (the article)

  7. #17
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    Ok. I was just looking at the pic above where it says chamber dimensions are the same. I'd think that a resizing die is going to bring the brass back to the same size regardless though.
    "You people have too much time on your hands." - scottryan

  8. #18
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    If the only difference between 5.56 Nato and .223 Rem chamber is the leade and freebore then why is the allowable headspace greater with 5.56 Nato?

  9. #19
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    Quote Originally Posted by slomo View Post
    If the only difference between 5.56 Nato and .223 Rem chamber is the leade and freebore then why is the allowable headspace greater with 5.56 Nato?
    You mean "allowable" before the bolt or barrel gets replaced?
    "You people have too much time on your hands." - scottryan

  10. #20
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    Yes. According to the data I've seen No go for .223 Rem is 1.4666" and No go for 5.56 is 1.4736". Why the difference if the cases of .223 and 5.56 are the same dimension from the cartridge base to shoulder.

    For instance, if I mounted a new barrel labeled .223 Rem and the bolt would close on a No go 1.4666" gauge the bolt/barrel headspace would be out of spec. but would not be out of spec if it were a 5.56 Nato chamber.
    Last edited by slomo; 06-16-11 at 11:49. Reason: correction

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