Quantcast
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

5.56/.223 ?

Discussion in 'Rifle Country' started by Lightsped, Feb 12, 2006.

Thread Status:
Not open for further replies.
  1. Lightsped

    Lightsped Member

    Joined:
    Feb 2, 2003
    Messages:
    1,240
    Location:
    Kennesaw, Georgia
    What is the difference? I am in the market for another AR and am not sure what the differences are in 5.56 vs .223. Accuracy, price, quantity, etc.....?
     
  2. Coltdriver

    Coltdriver Member

    Joined:
    Dec 26, 2002
    Messages:
    2,192
    Location:
    Colorado
    You will be amazed and how much there is to learn from what appears to be such a simple question.

    Go here:

    http://www.ammo-oracle.com/
     
  3. powderbrass

    powderbrass Member

    Joined:
    Dec 9, 2005
    Messages:
    32
    Location:
    Waxahachie, TX
  4. ocabj

    ocabj Member

    Joined:
    Jan 22, 2003
    Messages:
    2,383
    Location:
    Riverside, CA
    Errr... I agree that 5.56mm is equal to .218 inches in terms of unit conversion, but that's not the difference between the 5.56NATO and .223 Remington cartridges.

    The link you posted has an explanation of the difference between the two cartridges, as well as the Ammo Oracle link.

    The difference is that 5.56NATO is loaded to higher pressures than the SAAMI specifications for .223 Remington. Also, 5.56NATO chambers tend to have longer throats and more headspace than a .223 Remington chamber.

    The bullet used in a 5.56NATO is the same bullet diameter used in a .223 Remington.
     
  5. MagnumCaliber357

    MagnumCaliber357 Member

    Joined:
    Jul 20, 2004
    Messages:
    305
    I believe you can shoot 223 in a 556 chamber but you cannot shoot 556 in a 223 chamber because of said pressure problems:D
     
  6. f4t9r

    f4t9r Member

    Joined:
    May 27, 2005
    Messages:
    2,670
    I use them both as the same and never had a problem.
    How tech you wanna get on this ?
     
  7. Coltdriver

    Coltdriver Member

    Joined:
    Dec 26, 2002
    Messages:
    2,192
    Location:
    Colorado
    With regard to the 5.56 ammo and .223 ammo the bullets are exactly the same.

    The ammo-oracle has a tremendous amount of detail on the differences including the sutble but meaningful differences. Its many mb of information.

    I know it is said that some 5.56 can cause high pressures in a .223 chamber but I have never ever heard of a single incident in which it mattered one way or another. I own both caliber designations and have reloaded for both of them.

    If someone has first hand or documented knowledge of a blow up with 5.56 in a .223 chamber let us know. I am always open to correction on this board because we have some great experience and talent here.
     
  8. Lupinus

    Lupinus Member

    Joined:
    Oct 6, 2005
    Messages:
    3,502
    Location:
    Upstate SC
    basicly 5.56 has higher preasure.

    How much higher or enough to make the gun go boom? Dunno...but I will let others be the guinea pigs and report.
     
  9. TexasRifleman

    TexasRifleman Moderator Emeritus

    Joined:
    Feb 16, 2003
    Messages:
    18,302
    Location:
    Ft. Worth
    So even though we know for sure the pressures will exceed the standard max, I'm not sure it's OK to do just because nothing has blown up yet.
     
  10. rangerruck

    rangerruck Member

    Joined:
    Jan 12, 2006
    Messages:
    8,374
    Location:
    Texas, baby!
    put simply the 55.6 roudn is a little hotter, the case a little thicker, for mil spec purposes. you should be able to fire both in anything, with no problems. no mfgr makes a bolt action rifle that will fire 223, then fail at 556.
     
  11. lobo264

    lobo264 Member

    Joined:
    Jan 25, 2006
    Messages:
    9
    Odd. I just went through that myself. I went to the local gunshop to pick up some .223REM and they were out. The nice lady (seriously) sold me some 5.56mm, and off I went.
    I got home, and was having doubts about firing 5.56mm in .223REM, recalling that warning: "only fire ammunition in firearms chambered for it." Hop on the web for a quick search and found out:

    SAAMI says no.

    Winchester says no. (the ammo I got was whitebox 5.56mm, I wanted the other white box)

    Ruger says no. (M77 MkII, nice little rifle, btw)

    I'm not going to a guinea pig either, despite reports that other people have done it.

    I returned the ammo for a trade in a flavor pack of .223 REM, including some of that natec stuff.

    Take care.
     
  12. Lupinus

    Lupinus Member

    Joined:
    Oct 6, 2005
    Messages:
    3,502
    Location:
    Upstate SC
    what I would want to see is just how much higher the preasure is, and then see at what preasure the individual gun is made to withstand before going boom...in a bad way.
     
  13. Don't Tread On Me

    Don't Tread On Me Member

    Joined:
    Jul 19, 2004
    Messages:
    2,213
    Location:
    FLORIDA
    I doubt the 5.56 would blow up a gun that has a tight .223 chamber. There's enough safety factor built into guns these days that are greater than the pressure differences between a .223 and a 5.56.


    I still wouldn't try it though.


    This is why you hear of "red box" and "black box" Hornady TAP. One is saami pressure, the other NATO. Being 75gr and loaded hot, the red box is not available to civilians (well, not suppose to be anyway) out of fear they'd load it into some ultra-tight .223 chamber and have some pressure issues. They know that law enforcement is going to be using good quality modern firearms. Bubba might be using some very old, or in bad shape .223 bolt gun with a tight chamber.
     
Thread Status:
Not open for further replies.

Share This Page