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Shooting 5.56mm in a .223 cal Chamber

Discussion in 'AR's, AK's, Silencers /Class III' started by Blondie70, Apr 14, 2018.

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  1. Blondie70

    Blondie70 Distinguished Poster MSGO Supporter

    I have a .223 Savage and want to shoot 5.56 in it. I have some 5.56 M-855 with green tip, 62 grains. With this round in chamber, I have .160" freebore. Sounds like plenty to me, but what do you chamber guys say about it? Do I have enuf freebore to be safe?
    Thanks, Pete
     
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  2. para40

    para40 Sr. Curmudgeon MSGO Supporter

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    You'll be fine.
    I wouldn't expect optimum accuracy from that round, especially if bulk ammo.
    But you never know.
    I am not a lawyer or expert,
    Just my opinion.
     

  3. Quickeye

    Quickeye Member MSGO Supporter

    It's difficult to give a short, good answer without knowing whether or not it's a bolt gun or semi-auto, like their Patrol Rifle, because barrel twist, length of barrel and bolt action or not, all will play a role in throat erosion, land erosion near the chamber, and accuracy.
    Also, how did you determine free bore(chamber leade)?:)
     
  4. HerrZnk

    HerrZnk Distinguished Poster

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    :yeah:
    Yes indeed your question raises many questions.
     
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  5. DEADEYE 1

    DEADEYE 1 Distinguished Poster MSGO Supporter

    I will let the others answer pertaining to free bore. I have owned the the older Colt AR-15s for almost 30 years. While the 1 in 7 twist rate is supposed to be best to shoot heavier bullets in the 223, I shot 64 grain bullets in mine years ago. I have not looked at the charts lately but the best I remember is that there is just a modest increase in power of the 5.56 compared to regular 223.
    I would guess that if you only shot a few that it might be ok. But if I were to shoot a lot, I might consider getting a new barrel in the 223 Wyld chamber.Or having your barrel re-chambered.
    Note ,I am not a Doctor, I just play one on TV.
     
  6. Blondie70

    Blondie70 Distinguished Poster MSGO Supporter

    Thanks for the info.
    It's a Savage bolt Axis. 9" twist. Got freebore by letting the rifle seat the bullet in the case. (multiple times)...whatcha think ?
     
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  7. turable.shot

    turable.shot Distinguished Poster

    Ok, if it will seat in the chamber, but not a steady diet of the .556.
    That's my opinion, I have the Axis.
    The book will not agree.
     
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  8. 2DARK2C

    2DARK2C Distinguished Poster

    my savage 111 in .223 ate 5.56 like candy. it grouped the best with 55g fmj and quickeye coaching me :) my 111 is a long action somehow factory made in .223 that quickeye shortened and crowned the barrel, fitted and lightened the stock.
     
  9. Henry Bowman

    Henry Bowman Distinguished Poster

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    If it was mine I know what I would do. I have been shooting military ammo in .223 chambered rifles since the 70's. Bolt guns, semi autos and TC Super 14's. Never had one problem.
     
  10. Blondie70

    Blondie70 Distinguished Poster MSGO Supporter

    I think all the Savage Axis' are long action. I did my own job on crowning the barrel...we shall see. Ain't the first one I have done the homebrew way..ha. Waiting on a rail for scope mounting to come in before testing. Will test with .223 and 5.56. I had the barrel cut to 16 1/2" and will use the ear protection device on the end of it.
     
    Last edited: Apr 15, 2018
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  11. Chicknman

    Chicknman Distinguished Poster MSGO Supporter

    I would say don't expect the best accuracy from military spec ammo. Also some of the stuff you are buying for cheap may have been rejected for being out of spec. I have no source to reference for this info but I did read it somewhere. Could be total bs.
     
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  12. 2DARK2C

    2DARK2C Distinguished Poster

    here is mine the day I picked it up at Quickeye's place.
    [​IMG]
     
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  13. Blondie70

    Blondie70 Distinguished Poster MSGO Supporter

    Very nice looking rifle !
     
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  14. 2DARK2C

    2DARK2C Distinguished Poster

    thanks :) Quickeye really went above and beyond by shortening and lightening the factory stock plus fabing up mounts so I could use a scope I already had.
     
  15. Blondie70

    Blondie70 Distinguished Poster MSGO Supporter

    Got mine all togetner and shot it today. It seems to like the 62 grain green tip in 5.56 really well !
     
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  16. DEADEYE 1

    DEADEYE 1 Distinguished Poster MSGO Supporter

    I did a little investigative study on this subject. When I do this I usually learn something I did not know. I read somewhere that the 556 can generate a good bit more pressure. Yet when reading the listing on different ammo, I found the net results to be close. For instance, For several years, I have been doing some target shooting with PPU ammo in different calibers. 22 Hornet, 22-250 and pistol ammo.
    I read that they have the same feet per second in similar weight bullets in 5.56 and .223.
    Also I have yet to see a Savage rifle that was not tough and accurate.
     
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  17. Blondie70

    Blondie70 Distinguished Poster MSGO Supporter

    I tried to find a 5.56 neck and throat reamer for my .223 (that I could afford) no go. Then I found I had somewhat over a tenth of an inch freebore ahead of the 62 grain 5.56 bullet I am gonna shoot. I think all is well, but I have read the cautions and forebodings....
     
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  18. Chicknman

    Chicknman Distinguished Poster MSGO Supporter

    I have a savage axis .223 that I just had the barrel cut and threaded. I haven't sighted in yet. I am not afraid to shoot 5.56 in it. I had a mossberg mvp that was actually chambered in 5.56. It wouldn't surprise me to find out that the axis is also chambered using a 5.56 reamer.
     
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  19. Chicknman

    Chicknman Distinguished Poster MSGO Supporter

    There doesn't seem to be a single example of a ruptured case or a blown up rifle from firing 5.56 in a .223 chamber on the Internet.
     
  20. Henry Bowman

    Henry Bowman Distinguished Poster

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    My honest opinion(and it's worth what you paid for it) is that all this BS about 5.56mm in a .223Rem and needing a Wylde chambering is just a market ploy to sell new barrels/rifles. I have shot every type of 5.56mm ammo out there in .223Rem chambered rifles and pistols in sunny weather, rainy weather, snowy weather in 100+degree days and -30 degree days. At sea level and up to 12,000 feet above sea level. In new guns,old guns, single shots, bolt guns and semi autos with absolutely ZERO problems of ANY kind.
    I will continue to do so.
     
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