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Thread: Are 5.56 mm x 45 cartridges safe to reload in .223?

  1. #1

    Are 5.56 mm x 45 cartridges safe to reload in .223?

    Good Morning All
    I recently picked up 100+ used 5.56 x 45 cartridges (S and B Headstamped) on my local range
    I realise that the spec. for these and .223 Remington are not quite the same and there seems to be conflicting info. on the internet as to whether they are safe to reload and fire in a .223 or not
    Should I just dump them or try a few checking for signs of pressure as usual?
    What do you all think?

  2. #2
    No you you should immediately send them to me ,foc , for examination / testing , I will eventually give a report as to their edification.

    "This year will go down in history. For the first time, a civilized nation has full gun registration. Our streets will be safer, our police more efficient, and the world will follow our lead into the future!"
    Adolph Hitler 1933

  3. #3
    While the external case dimensions are very similar, the .223 Remington and 5.56x45mm differ in both maximum pressure and chamber shape. The maximum and mean pressures for some varieties of the 5.56 mm (different cartridge designations have different standards) exceed the SAAMI maximum for the .223 Remington, and the methods for measuring pressures differ between NATO and SAAMI.[2] The 5.56 mm chamber specification has also changed since its adoption, as the current military loading (NATO SS-109 or US M855) uses longer, heavier bullets than the original loading. This has resulted in a lengthening of the throat in the 5.56 mm chamber. Thus, while .223 Remington ammunition can be safely fired in a 5.56 mm chambered gun, firing 5.56 mm ammunition in a .223 Remington chamber may produce pressures in excess of even the 5.56 mm specifications due to the shorter throat

    Above applies to Ammunition not brass

    reload with care and take usual precautions should be fine

  4. #4
    In my .223 all I use is 5.56 brass, over 4000 shots later... it's still good

  5. #5
    The local Federal cops use our range and leave hundreds of rounds 5.56 brass on the ground. I'm using it.~Muir

  6. #6
    Quote Originally Posted by Muir View Post
    The local Federal cops use our range and leave hundreds of rounds 5.56 brass on the ground. I'm using it.~Muir
    Me too, I like to think of it as a tax refund lol


  7. #7
    All my 223 was loaded with brass chucked out of an SA80. Just load develop like normal

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  8. #8
    Ok Gentlemen - Thank You all
    It has been suggested to me that I start with a load 10% below normal and work upwards - checking as always!

    Thank you again - off to the reloading room (all right the spare room! )

  9. #9
    Ed , am interested in doing the same with my .223 Howa , have read so much about not reloading 5.56 cases and firing them in a .223 but it is interesting to see that guys have had no probs with them , would be keen to try a hundred or so rounds . Let me know how yours go , all the best Joe .

  10. #10
    Will do Joe - it might be a week or two though

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