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Thread: 5.56mm NATO versus 223 Remington Chamber Differences

  1. #91
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    Brass thickness varies. As a general rule, yes, 5.56-specific brass (such as LC) is going to be thicker (and thus heavier) than .223 brass. But not always. The weight spread overlap is so great, that there's not much point in worrying about it.

    If you are loading "brass is brass" empties, for practice and plinking, then load to .223 loading data. You are unlikely to notice any POI or accuracy difference, between .223 and 5.56 load specs, using the same bullet. We all know it is an American birthright to be able to buy a sub-MOA AR right over the counter, but most aren't. And most shooters aren't, either.

    If you have to have 5.56-performance ammo that you load, then use a single batch of brass (LC is a good source) and load it up for your rifle.

  2. #92
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    Its the way the chamber is cut. In some .223 chambers, a .556 round will spike in pressure. In others, it won't make a difference. I have 556 and .223 Wylde barrels and I just shoot whatever is cheapest. That happens to be handloads all the time but if someone was selling factory ammo cheaper, I would buy that instead.

  3. #93
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    Will accuracy be impacted if you shoot 223 in a 5.56mm chamber?

    Meaning is running 5.56mm ammo in a 5.56mm chamber inherently more accurate than running 223 ammo in a 5.56mm chamber?

  4. #94
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    Quote Originally Posted by ad_infinitum View Post
    Will accuracy be impacted if you shoot 223 in a 5.56mm chamber?

    Meaning is running 5.56mm ammo in a 5.56mm chamber inherently more accurate than running 223 ammo in a 5.56mm chamber?
    The quality of the barrel, ammo, and skill of the shooter make far more difference.

  5. #95
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    Quote Originally Posted by ad_infinitum View Post
    Will accuracy be impacted if you shoot 223 in a 5.56mm chamber?

    Meaning is running 5.56mm ammo in a 5.56mm chamber inherently more accurate than running 223 ammo in a 5.56mm chamber?
    Your barrels 'potential accuracy' may last longer shooting lower pressure .223 ammo. The higher the pressure the ammo - The faster the throat will erode and once it is screwed there is no fixing it.

    Sometimes too a given barrel will perform better at a lower velocity. Faster does not automatically = more accurate. Generally reloaders will notice a place in their load workup where the accuracy is best and then as velocity increases after that point the groups tend to open up. Depends on the barrel where that sweet spot is...

  6. #96
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    Interesting point you make

  7. #97
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    Quote Originally Posted by ad_infinitum View Post
    Will accuracy be impacted if you shoot 223 in a 5.56mm chamber?

    Meaning is running 5.56mm ammo in a 5.56mm chamber inherently more accurate than running 223 ammo in a 5.56mm chamber?
    The quality of the ammo is more important than the nominal designation. .223 pressure OTMs will outshoot almost any 5.56 load, but I've loaded 5.56mm pressure OTMs that will out shoot a bunch of .223 ammo.

    Each load and Each barrel are unique.
    "You people have too much time on your hands." - scottryan

  8. #98
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    Why do people insist on saying "5.56mm NATO chamber," as if all things that were designed to shoot 5.56mm NATO have the same chamber?

    The M249 has a difference chamber, and shoots 5.56mm NATO.
    The M27 (HK416) has a different chamber and shoots 5.56mm NATO.
    The Stoner 63 had a different chamber to the M16, although it was gone by the time 5.56mm NATO came along.
    etc
    etc.

  9. #99
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    This is a long old thread.
    But here's my 3cents worth.

    There are chamber diffs, and those diffs come from a few factors:
    1) who made the reamer
    2) what std (spec) are reamers made to
    3) not within the same framework for std (spec)

    Can't really find the 556 NATO spec in the SAAMI docs, thus comparing it to 223rem is like green apple vs the red apple.
    PTG vs JGS vs Clymer, all different.
    Will some rounds fit in other types of chambers? Can you put a 275-75-16 BFG KO2 on a truck that is normally a 255-60-16.

    http://ar15barrels.com/tech.shtml

    Wylde's are interesting. Not sure if any spec of a Wylde falls outside any of the cartridge specs for any SAAMI 223rem, or 556 NATO.

    And then you have the over-arching question, for what application is it for? A SAAMI 223rem Match cut may be a better choice over a 223rem Wylde, or vice-versa. Guess it all depends.

    What we do/should agree on though, there are lots of differences beyond just the lead-in spec.

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