Page 2 of 11 FirstFirst 1234 ... LastLast
Results 11 to 20 of 103

Thread: 5.56mm NATO versus 223 Remington Chamber Differences

  1. #11
    Join Date
    Aug 2010
    Location
    Charlotte, NC
    Posts
    303
    Feedback Score
    0
    Awesome and informative post Molon!!

  2. #12
    Join Date
    Jan 2011
    Location
    NV
    Posts
    3
    Feedback Score
    0

    Thumbs up

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

  3. #13
    Join Date
    Feb 2011
    Posts
    869
    Feedback Score
    13 (100%)
    Tagged....

    Thanks, Molon!!

  4. #14
    Join Date
    Apr 2011
    Posts
    88
    Feedback Score
    0
    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
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    32,788
    Feedback Score
    14 (100%)
    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.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  6. #16
    Join Date
    Apr 2011
    Posts
    88
    Feedback Score
    0
    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
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    32,788
    Feedback Score
    14 (100%)
    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.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  8. #18
    Join Date
    Oct 2010
    Location
    NVa
    Posts
    46
    Feedback Score
    0
    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
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    32,788
    Feedback Score
    14 (100%)
    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?
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  10. #20
    Join Date
    Oct 2010
    Location
    NVa
    Posts
    46
    Feedback Score
    0
    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 10:49. Reason: correction

Page 2 of 11 FirstFirst 1234 ... LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •