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5.56 in a Rem .223 rifle

Discussion in 'Rifle Country' started by Russell13, Jun 3, 2020.

  1. Russell13

    Russell13 Member

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    So we have all been told that you shouldn’t shoot 5.56 mm out of a .223 rifle. Does anyone have any experience with this? Has anyone ever experienced a failure from using 5.56 in a .223?
    I have a savage bolt action in .223, I have shot 5.56 through it without a problem. I could even tell the difference between the two when shooting?
    Manufacturers tell you not to do it just for liability purposes. They also tell you not to shoot reloads or hand loads through there rifles but everyone does.
     
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  2. 12Bravo20

    12Bravo20 Member

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    I had problems with my H&R Handi-Rifle with a 223 chamber when shooting 5.56 ammunition. The 5.56 ammo would cause the action to pop open upon firing. And I am not the only one to have that issue. A lot of it is how tight or loose the 223 chamber is cut. I would not shoot 5.56 in a tight 223 chamber.
     
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  3. Varminterror

    Varminterror Member

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    Can we have someone set up a macro to just link these back to the last 5 versions of this same thread and then lock the thread?
     
  4. 12Bravo20

    12Bravo20 Member

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    .

    That would be nice. Or at least a sticky. Didn't we just discuss this in the reloading section?
     
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  5. herrwalther

    herrwalther Member

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    The TLDR answer of this question is: not recommended. Just because 5.56 will work in one 223 rifle doesn't mean they all will.
     
  6. jmr40

    jmr40 Member

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    It would be extremely rare to find a 223 rifle that won't work just fine with 5.56 ammo. In fact you're far more likely to find individual 30-06 rifles that won't work with some factory 30-06 ammo than you are to find a 223 rifle that will give you problems with 5.56 ammo.

    The most likely problem will be a semi-auto chambered in 223. Many 5.56 loads will not function reliably. But there are no current 223 chambered semi-auto rifles being made and only a handful ever made.
     
  7. Bfh_auto

    Bfh_auto Member

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    I have in an H&R without issue. This one has an incredibly long throat.
    I consider it to be a do at your own risk. Kind of like loading off the books.
     
  8. NIGHTLORD40K

    NIGHTLORD40K Member

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    I seriously doubt any gun manufacturer has cut a .223 chamber lead short enough to cause problems with 62gr. bullets in the last 15 years at least. They know that sooner or later somebody is going to put a 5.56 round in that gun and dont want the liability of blowup. 70grs+ though......I wouldnt try it without calling the maker first.
     
  9. Russell13

    Russell13 Member

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    I tried 70 grain but could t get good groups with them.
    The only problem I ever ran into was some of the cheaper Fiocchi ammo. It wouldn’t eject the casing after being fired. This was on a bolt action and I had to hit the bolt handle to get it out. Ended up putting the ammo in an AR and it shot fine
     
  10. swagbrdr

    swagbrdr Member

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  11. 12Bravo20

    12Bravo20 Member

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    My H&R Handi-Rifle with a 223 chamber was made in 2006 and it definitely had problems with 5.56 ammo. Like I said it would pop the action open every time. Not worth the risk. I'm sure that in the last 15 years that manufacturers have started reaming 223 chambers a littler closer to 5.56 specs for safety/liability reasons. If you have a 223 chambered rifle with a tight chamber or an older rifle, I would not risk it. YMMV.
     
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  12. cdb1

    cdb1 Member

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    Just to be safe I wouldn’t do it.
     
  13. GunnyUSMC

    GunnyUSMC Member

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    It helps to know what is different about the two cartridges. Pressure is the biggest issue when shooting 5.56 in a 223 chamber.
    Another thing is that not everyone cuts their chambers to the same specs. So one 223 chamber may have a longer throat and freebore then another.
    You can have a gunsmith ream a 223 to 556.
    BCF5CC4B-6E4A-445C-AEC9-A4C8F53C247B.jpeg CD72C880-3728-476C-BF8E-46495202B76B.jpeg
     
  14. skeeterfogger

    skeeterfogger Member

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    Get same quandary about shooting 308 win in 7.62x51. Yes it will. Yes 308 win is a bit higher pressure. But should you do it?
    I won't. The guns are ammo rated. Not worth the chance.
    I have heard of people nipping the chamber on a .223 to properly accept a 5.56 but the gun was, in what way I don't know, said to be same mechanically and physically as a 5.56 of same brand.
    They case difference is small. The pressure is some higher. I guess it's really a question for the manufacture as to if a .223 of that brand is the same as their .5.56 and what are the machining differences.
     
  15. Varminterror

    Varminterror Member

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    Which specific rifle do you have which is chambered for 7.62x51 rather than 308win?

    I wrote this up at another site a few years ago regarding the pressure standard - the chamber standards are exactly the same, which is not the case for 5.56x45 and 223 Remington, the only differences are pressure standard and measurement method:

     
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  16. skeeterfogger

    skeeterfogger Member

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    Then you shoot them. Shooting other than stated for the weapon is a fools errand.
     
  17. Jessesky

    Jessesky Member

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    That’s part of why the 223 Wylde chamber was introduced. It’s approximately the chamber dimensions of the 5.56 with the freebore of the 223 rem.

    My AR is 223 wylde, and most I see today are

    44785D5C-B963-411E-9071-3AADF6D85299.png
     
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  18. Big_Al

    Big_Al Member

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    I'm curious why s&w lists both calibers on their site for the mp sport 2.
     
  19. LoonWulf
    • Contributing Member

    LoonWulf Contributing Member

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    Shooting even correctly labeled ammo for a weapon can be a fools errand, depending on the weapon.
    If your gonna stick any ammo in your gun, you best understand what possible results are going to occur.
     
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  20. Jessesky

    Jessesky Member

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    From my understanding, it is ‘unsafe’ to fire 5.56 in a 223. On the opposite end, it IS safe to fire 223 in a 5.56, but you will potentially have a slight loss in accuracy.

    223 has been SAAMI standardized. 5.56 is not.

    I’m literally paraphrasing this lucky gunner article because it would be impossible to remember all of these dimensions and specs. Should answer all of your questions.

    https://www.luckygunner.com/labs/5-56-vs-223/
     
  21. otisrush

    otisrush Member

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    I'm assuming either (or both):
    1. Don't want to take the chance that, by only listing 5.56, prospective customers don't disqualify the Sport 2 from their purchase consideration. "Well, it doesn't shoot .223, so I've got to consider something else!"
    2. Reduce pre-sales (or post-sales) support calls.
     
  22. Varminterror

    Varminterror Member

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    I thought it was a pretty simple question. Very very few rifles are chambered specifically as 7.62x51, and any such made in the US is made to SAAMI standards, for which 308win and 7.62x51mm are identical.

    So which rifle do you have, in particular, which is stamped as 7.62x51 and made outside of the US?
     
  23. Casefull

    Casefull Member

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    This entire thread is a non-issue. It’s a stupid discussion because the rounds are interchangeable and do not cause problems in modern guns in either .223 or .308. I have reloaded for both calibers for 35 years and used military and commercial Brass interchangeably in bolt action and semi auto rifles. Some of you guys act like every round of Ammo produced is some exactly machined part down to .0001 inch accuracy. Ha ha
     
  24. 12Bravo20

    12Bravo20 Member

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    Reloads and factory ammo can be different. I agree about reloads since you use the exact same dies for both 223 and 5.56. And yes some guns with a 223 chamber will have problems with 5.56 ammo, but not all will.
     
  25. 351 WINCHESTER

    351 WINCHESTER Member

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    I had the exact same problem.
     
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