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.223 remington vs. 5.56 nato: What you don’t know could hurt you

Discussion in 'Caliber Corner' started by SJ 40, Jan 21, 2013.

  1. SJ 40

    SJ 40

    Jan 17, 2011
    Came across this warning today and some may not know the differences. Thought what with all the first time new semi auto owners it maybe worth sharing.

    Is firing a 5.56 NATO cartridge in your .223 Remington chambered AR15 dangerous? Or do Internet forum-ninjas and ammunition companies selling you commercial ammo instead of surplus overstate the dangers? Believe it or not, a real danger exists, and some gun owners who think they are doing the right thing may not be safe.

    The Cartridges

    The .223 Remington and 5.56×45 NATO cartridges are very similar, and externally appear the same. But there are some differences that lie beneath the surface.

    The 5.56 case has thicker walls to handle higher pressures, meaning the interior volume of the case is smaller than that of a .223. This will alter the loading data used when reloading 5.56 brass to .223 specs.

    Some 5.56 loads have a slightly longer overall length than commercial .223 loads.

    The Chambers

    The significant difference between the .223 Rem and 5.56 NATO lies in the rifles, rather than the cartridges themselves. Both the .223 and 5.56 rounds will chamber in rifles designed for either cartridge, but the critical component, leade, will be different in each rifle.

    The leade is the area of the barrel in front of the chamber prior to where the rifling begins. This is where the loaded bullet is located when a cartridge is chambered. The leade is frequently called the “throat.”

    On a .223 Remington spec rifle, the leade will be 0.085”. This is the standard described by the Sporting Arms and Ammunition Manufacturers’ Institute, Inc. (SAAMI). The leade in a 5.56 NATO spec rifle is 0.162”, or almost double the leade of the .223 rifle.

    A shorter leade in a SAAMI spec rifle creates a situation where the bullet in a 5.56 NATO round, when chambered, can contact the rifling prior to being fired. By having contact with the rifling prematurely (at the moment of firing), chamber pressure can be dramatically increased, creating the danger of a ruptured case or other cartridge/gun failure.

    The reverse situation, a .223 Rem round in a 5.56 NATO gun, isn’t dangerous. The leade is longer, so a slight loss in velocity and accuracy may be experienced, but there is not a danger of increased pressures and subsequent catastrophic failure.

    How serious is the danger of firing 5.56 ammo in .223 guns? Dangerous enough that the SAAMI lists 5.56 military ammo as being not for use in .223 firearms in the technical data sheet titled “Unsafe Firearm-Ammunition Combinations.”

    ATK, the parent company of ammunition manufacturers Federal Cartridge Company and Speer, published a bulletin entitled “The Difference Between 223 Rem and 5.56 Military Cartridges.” In this bulletin, ATK stated using 5.56 ammo in a .223 rifle could result in “…primer pocket gas leaks, blown cartridge case heads, and gun functioning issues.”

    However, the danger may be lower than SAAMI or ATK suggest. In Technical Note #74 from ArmaLite, the company states “millions of rounds of NATO ammunition have been fired safely in Eagle Arms and ArmaLite’s® SAAMI chambers over the past 22 years,” and they have not had any catastrophic failures.

    According to ArmaLite:

    “Occasionally a non-standard round (of generally imported) ammunition will fit too tightly in the leade, and resistance to early bullet movement can cause elevated chamber pressures. These pressures are revealed by overly flattened primers or by powder stains around the primer that reveal leaking gasses.”

    What Do You Have?

    So, if you own a rifle chambered for the .223 for 5.56, do you know for which caliber it is really chambered?

    Many match rifles are chambered in .223 Remington (SAAMI specs) for tighter tolerances, and theoretically better accuracy.

    Many of the AR-15’s currently sold on the market are made for the 5.56 NATO cartridge. If you own one of these, you should be fine with any .223 or 5.56 ammunition.

    However, ATK dropped this bomb in the bulletin on the .223/5.56:

    “It is our understanding that commercially available AR15’s and M16’s – although some are stamped 5.56 Rem on the receiver – are manufactured with .223 chambers.”

    So, even if your AR is stamped 5.56, is it really? Check your owner’s manual or call the company directly and make sure you get an answer you feel comfortable with.

    As if the confusion regarding the .223 vs 5.56 chambers wasn’t enough, there is a third possibility in the mix, that is being used by at least one major manufacturer. The .223 Wylde chamber is a modified SAAMI-spec .223 chamber that allows for the safe use of 5.56 NATO rounds, but maintains tighter tolerances for better accuracy.

    Yeah, yeah… What’s the bottom line?

    Here’s the bottom line. If you want to follow the safest possible course, always shoot .223 Remington ammunition. The .223 Rem cartridge will safely shoot in any rifle chambered for the .223 or 5.56.

    If you want to shoot 5.56 NATO rounds, make sure you have a rifle designed for the 5.56 military cartridge. Shooting 5.56 in a normal .223 Rem rifle can result in bad things.
    SJ 40
    Doc McGlock likes this.
  2. GIG4FUN


    Jan 13, 2013
    Colt M4 an Sig M400 (good on both counts here) and for some reason I have seen this a million times. I sure hope it is known by everyone.

    BUT you know.... they're out there :ambulance:

  3. dkf


    Aug 6, 2010
  4. barth

    barth six barrels

    Oct 7, 2011
    The Free Zone
    My simple analogy for 5.56 vs .223?
    Is +P vs standard pressure ammo.
    Not all guns are +P rated.
    You might get away with shooting a small quantity +P ammo
    through a gun not +P rated.
    But maybe not and that's on you.

    My Bulgarian Arsenal AK74 is a mil-spec 5.56 NATO gun.
    Last edited: Jan 21, 2013
  5. AtlantaR6


    Jul 29, 2004
    S&W M&P Sport.... Does anyone know?
  6. banger


    Nov 8, 2005
    Where evil lives
    By way of a rhetorical question....

    When was the last time anyone here actually heard of ANYONE having ANY problems firing 5,56 in a .223?

    Personally I have been shooting for more years than many people on this forum have been alive.

    This includes the years when a .223/5.56 was considered rare and unique.

    Back when surplus ammo was WIDELY available and for very modest prices.

    I have fired more thousands than I probably care to recall and witness even more.

    Yet, I have NEVER seen or heard of ANY problem using the ammo interchangeably.

    But, Hey that's just me.

    EDIT: Simply to put perspective on this issue...The two cartridges have peacefully coexisted for over 50 years!

    And yet still no DOCUMENTED damage to firearms or persons as a result.
    Last edited: Jan 21, 2013
  7. packinaglock

    packinaglock John 3:16

    May 1, 2007
    Loxahatchee Fl
    My AR states it can use either. :supergrin:
  8. ancient_serpent


    Jun 6, 2008
    Yeah, never heard of any problems or seen any either. My AR's are all in 5.56, so it's not a worry.
  9. Brucev


    Jul 19, 2009
    Re: OP. Proof that Chicken Little lives. Similar warnings about .308 Winchester/7.62mm NATO rounds are also circulated. And in extreme cases, CL and company have a point... in those odd extreme cases. Like anything else, there will be instances when someone w/ a minimum chamber and a maximum dimension round will have some excitement. But the norm is not the single odd instance. The norm is the experience of the broad majority of users. And the broad majority of users firing .223/5.56mm is that in normal common rifles w/ normal commercially cut chambers, throats, bores, etc., CL is an oddity.
  10. SCmasterblaster

    SCmasterblaster Millennium Member

    Sep 24, 1999
    Hartford, Vermont
    Thanks for the informative post.
  11. If you own said gun... then look at barrel stamp and owners manual... DUH :wow:
  12. RJ's Guns

    RJ's Guns

    Dec 25, 2010
    I am also an old-timer and I have never had, heard or seen any problems using the ammo interchangeably

  13. eyelikeglasses

    eyelikeglasses Hooah, Hooah.

    Apr 10, 2009
    The Sunshine State
    5.56, look on the barrel.
  14. tango44


    Jun 16, 2005
    Miami Florida
    Colt Gov Carbine here, 223 is all I use!
    Thanks a lot fot taking the time to write about it!
  15. Foxtrotx1


    Jan 29, 2010
    Scottsdale AZ