.223 vs 5.56???

Discussion in 'Gun Talk' started by Keith P, Mar 17, 2016.

  1. Keith P

    Keith P Member

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    I know that they're essentially the same, but I've also heard that you shouldn't shoot 5.56 in a .223 because the 5.56 has higher chamber pressures.

    My rifle is a Remington 700 and I've shot both in it, but I'm wondering if I should stick with .223, or is it just the labeling on the box that makes them different? Maybe it's true military-issue ammo that's different and what you buy is just a labeling issue.

    Better safe than sorry.

    Keith
     
  2. abdiver7777

    abdiver7777 abdiver7777

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    Only shoot the caliber that is stamped on the barrel....... period........

    Carry on.........
     
  3. invictus

    invictus AVD

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    5.56 has higher pressures than .223, you will risk related failures.
     
  4. mike garrahan

    mike garrahan TheSabreGuy

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    Google .223 vs 5.56. There is a ton of info but basically it has to do with chamber throat length and pressure. If you have a .223 to be completely safe you should only shoot .223 ammo. 5.56 will work but depending on your rifle you could have problems caused by excessive pressure.
     
    Fishslayer likes this.
  5. fly liner

    fly liner I've posted enough I should edit this section

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    X2
     
  6. Keith P

    Keith P Member

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    Thanks, guys. Better safe than sorry so I'll stick with .223 and give my remaining 5.56 to my son to run through his AR. I've probably shot only 10 or 12 rounds of 5.56 in my 700 so I should be OK.
     
  7. desertbonito

    desertbonito Member

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    Throating depth/profile and radial chamber clearances are the principal differences. You won't go wrong using factory 223 Rem in guns so marked. If reloading ammo is in the cards, follow Manual data closely. Mil-spec 5.56 x 45 ammo is loaded with thicker brass and heavier powder weights than is commersh 223 Rem.
     
  8. Jim n cali

    Jim n cali Member

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    Spend $100 and have your rifle chamber hit with a Wylde reamer and shoot both.
     
    Bigpondonly likes this.

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