Can i mix 223 and 556 in the same mags?

Can i mix 223 and 556 in the same mags?

This is a discussion on Can i mix 223 and 556 in the same mags? within the Defensive Rifles & Shotgun Discussion forums, part of the Related Topics category; Either one mag of one and another of the other? Or mixed in the same mag? Have a rifle cambered for both. Sorry for the ...

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Thread: Can i mix 223 and 556 in the same mags?

  1. #1
    Member Array AlDente67's Avatar
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    Can i mix 223 and 556 in the same mags?

    Either one mag of one and another of the other? Or mixed in the same mag?

    Have a rifle cambered for both.

    Sorry for the dumb question.


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    Distinguished Member Array SCXDm9's Avatar
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    Yes

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    Sure you can not sure why but it will feed just fine.

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    Chambered for both? It must be 5.56x45 NATO or .223 Wylde. If you have a standard .223 chamber do not fire 5.56x45 from it. This would result in excessive and dangerous chamber pressure.
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    Senior Member Array kb2wji's Avatar
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    So long as your rifle is chambered 5.56, yes. I wouldnt expect pinpoint accuracy though. I'm no ballistics expert, but I would imagine all else being equal, the .223 and 5.56 may have slightly different points of impact at distance. I could be wrong though. I'm sure smarter folks will chime in....
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    Member Array skunkworks's Avatar
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    Just don't leave them mixed and loaded for too long. strange things may happen when they are left alone in the dark for long.
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    Case dimensions are the same, the difference is in the longer throat of the 5.56 chamber. 5.56 typically use longer (& heavier) projectiles loaded to higher pressures. I've used reloaded 5.56 cases exclusively in my .223. If your rifle is stamped .223/5.56, it's a 5.56.
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    VIP Member Array Taurahe's Avatar
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    Quote Originally Posted by OldVet View Post
    Case dimensions are the same, the difference is in the longer throat of the 5.56 chamber. 5.56 typically use longer (& heavier) projectiles loaded to higher pressures. I've used reloaded 5.56 cases exclusively in my .223. If your rifle is stamped .223/5.56, it's a 5.56.
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    Distinguished Member Array Hodad's Avatar
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    Think of it this way: a .223 is a citizen round, 5.56 a military round. A little different as far as ballistics are concerned, but should not be a problem as long as your weapon is spec'd for 5.56.

    I guess my question would be : Why would you mix them?
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    Distinguished Member Array GlassWolf's Avatar
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    Will mixing .223 and 5.56 cause a malfunction? no.
    Would I recommend doing it? Also no. Mixing even different types of .223 will cause problems for you in regard to accuracy, since each round has a specific trajectory, based on it's design. It'd be like trying to bowl, and using a different weight ball for every frame. You'll have no consistency.
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    Member Array AlDente67's Avatar
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    Quote Originally Posted by Hodad View Post
    Think of it this way: a .223 is a citizen round, 5.56 a military round. A little different as far as ballistics are concerned, but should not be a problem as long as your weapon is spec'd for 5.56.

    I guess my question would be : Why would you mix them?
    Because I have a pile of both on hand...223 brass and 5.56 brass, and just a few mags from magpul that are marked for both designations. The rifle is stamped 556/223 on the barrel.

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    Distinguished Member Array Hodad's Avatar
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    Quote Originally Posted by AlDente67 View Post
    Because I have a pile of both on hand...223 brass and 5.56 brass, and just a few mags from magpul that are marked for both designations. The rifle is stamped 556/223 on the barrel.
    Good reason. Question answered.
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    Senior Member Array dV8r's Avatar
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    Quote Originally Posted by skunkworks View Post
    Just don't leave them mixed and loaded for too long. strange things may happen when they are left alone in the dark for long.
    Yeah... Like the FN 5.7
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    Senior Member Array tubadude's Avatar
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    You'd better send me the 5.56 just to be on the safe side.

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