Can .223 be used in 5.56?


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nstyn8
May 18, 2008, 11:13 PM
I have been wondering if I should go with the 5.56 nato or the .223.
I heard that you can use the .223 in a 5.56. But not the other way around due to pressure from the different rounds. Is this true or should the rifle be specific to except both or am I just uninformed? Please let me know what I should do. I don't want to damage a some gear by being uninformed.:confused:

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MaterDei
May 18, 2008, 11:15 PM
You are correct. If you want to be able to shoot both get a 5.56.

AR-15 Rep
May 18, 2008, 11:25 PM
Almost all AR style rifles are chambered 5.56mm it is kind of the industry standard.

jdc1244
May 18, 2008, 11:31 PM
Just make sure when shopping that a given rifle will chamber both; some rifles will be marked for .223 but can also chamber the 5.56, like the CZ 527.

lmccrock
May 19, 2008, 10:07 AM
There is another chamber called the Wylde which is usually seen in some Rock River rifles. It is considered a good intermediate chamber and will shoot both.

This may be more data than you want, but here is a comparison of 223 vs 5.56 chambers. (http://www.ar15barrels.com/data/223vs556.pdf)

Lee

Zach S
May 19, 2008, 10:09 AM
Almost all AR style rifles are chambered 5.56mm it is kind of the industry standard.
Something else to note here is that some ARs are marked .223 on the lower, however the bbl is marked 5.56.

ambidextrous1
May 19, 2008, 10:30 AM
Please clarify this for me:

Is it safe to assume that it's safe to fire a 5.56mm cartrideg in a .223 if it can be chambered? :confused: :eek:

Gingerbreadman
May 19, 2008, 10:41 AM
Check with the manufacturer to see if you can shoot 5.56 in a .223 gun.

A 5.56 bbl will fit .223. Not necessarily the other way around.

s2brutus
May 19, 2008, 11:23 AM
ambidextrous,

"They" say not to shoot 5.56 in any rifle chambered specifically for .223, but as is the case most of the time, most of this is likely just legal azz-covering.

My H&R Handi-rifle is chambered in .223, but I've shot plenty of 5.56 NATO in it. You CAN tell the difference because it won't extract and eject 5.56. The cases have to be knocked out with a light tap from a cleaning rod. But, if you note the amount of "meat" in the chamber area of a Handi-rifle in .223, there's no way 5.56 is going to hurt it.

Just having to tap the case out is enough of a pain in the azz to keep me from shooting 5.56 in it unless I just have to, but if I had to shoot 5.56 in it I wouldn't lose a minute's sleep over it.

:)

fletcher
May 19, 2008, 11:27 AM
Is it safe to assume that it's safe to fire a 5.56mm cartrideg in a .223 if it can be chambered?

For DPMS, I know you should not do that. Can't speak for other manufacturers.

JCUMM2
May 19, 2008, 11:43 AM
"They" say not to shoot 5.56 in any rifle chambered specifically for .223, but as is the case most of the time, most of this is likely just legal azz-covering.

No It is not. The 5.56 cartirdge has somewhat larger dimensions and runs at significantly higher pressure. Many Ar15s chambered for 223 do not cycle well and blow out primers if 5.56 ammo is used. This is particularly true for rifles with minimum sized 223 target chambers. Bushmaster and Compass Lake National Match chambers in particular do not handle 5.56 well. Make sure you know what chamber you have before using any 5.56 ammo. This is not just hearsay. It is personal experience is shooting match ARs in highpower competition. I have seen many people have trouble in matches trying to shoot 5.56 ammo in target chambered ARs.

benson2255
May 19, 2008, 12:04 PM
listen to jcumm2 he is spot on. no 5.56 in .223 but should be able to .223 in 5.56. best bet, manufacturers recommendation. They usually know what they are talking about and what their gun is designed for.

s2brutus
May 19, 2008, 12:27 PM
They usually know what they are talking about and what their gun is designed for.

Yeah, benson, I hear ya'.......

They'll also tell you not to shoot 7.62 NATO in a .308 when commercial .308 maximum pressures are up to 12,000 psi HIGHER than 7.62 NATO avg. max. pressures.

:rolleyes:

RockyMtnTactical
May 19, 2008, 01:10 PM
http://ammo.ar15.com/

AR15barrels
July 4, 2008, 03:24 AM
An even better comparison of 223 and 5.56 chamber dimensions is here:

http://www.ar15barrels.com/data/223-556.pdf

AR15barrels
July 4, 2008, 04:39 AM
Doh, doubletap...

Onmilo
July 4, 2008, 11:06 AM
Same thing goes for shooting .223 Rem in a 5.56 chamber as shooting .308 in a 7.62X51 chamber with a notable exception.

You can use any bullet weight and load in a 5.56 chamber as long as the twist rate can accomodate the bullet weight.

The 7.62X51/.308 gets a bit more complicated because .308 commercial ammunition is loaded to higher pressures in some loads and not really recommended for shooting in most 7.62X51 chambered rifles.

The big problem comes when people try to reload commercial ammunition cases that have been fired in Mil-Spec dimension chambers.

The additional case stretching causes the thinner commercial cases to crack and seperate at a much faster rate than the thicker, larger dimension military cases.

If you reload you really need to take the time to seperate commercial cases from military cases and anneal the commercial cases prior to reloading them.

If you don't, then buy a broken shell extractor tool and keep it handy, you will likely need it sooner than later.

chris in va
July 4, 2008, 11:26 AM
Which begs the question.

Why did they come out with .223 that is slightly different from 5.56? .308 isn't like that.

Ridgerunner665
July 4, 2008, 11:47 AM
Which begs the question.

Why did they come out with .223 that is slightly different from 5.56?

The military demanded 3,240 fps from a 55 grain bullet....from a 20 inch barrel...thats why.

It was Remingtons idea to "tone it down" in civilian trim...after all they were only trying to do slightly better than the 222 Remington...or equal the 222 Rem. Mag.

Uncle Sam demanded more.

Onmilo
July 4, 2008, 08:07 PM
.308 is different from 7.62X51 by the length of the headspace dimensions and the thickness of the cartridge case walls, commercial cases being thinner.

.223 Remington is different from 5.56 by the length of the throat leed and the thickness of the cartridge case walls, commercial cases again are thinner than 5.56 though pressures usually run lower in commercial loadings.

AR15barrels
July 5, 2008, 02:08 AM
223 Remington is different from 5.56 by the length of the throat leed and the thickness of the cartridge case walls, commercial cases again are thinner than 5.56 though pressures usually run lower in commercial loadings.

I would disagree on commercial 223 brass being any different than military 5.56 cases.
Here is my weight analysis of a bunch of different headstamps.

www.ar15barrels.com/data/223weights.xls

Note that military cases are often times lighter than commercial cases.
If military 5.56 cases were truly thicker, it goes to reason that they would weigh more.
While military 30 caliber brass is certainly thicker, I don't believe it to be the same case with military 5.56 brass.

csmkersh
July 5, 2008, 10:21 AM
My Winchester M70 Carbine won't even chamber 5.56 LC stuff. It's definately a .223 gun. I'm considering finding a inexpensive bolt stick and having the chamber modified to 5.56 dimensions.

My Bushmaster eats anything and doesn't burb. :)

Der Verge
July 6, 2008, 12:33 AM
I am not trying to be a jerk here, but this question is asked on every message board by someone new, at least once a week. Wikipedia can answer this for you.

AR15barrels
July 7, 2008, 01:49 PM
I am not trying to be a jerk here, but this question is asked on every message board by someone new, at least once a week. Wikipedia can answer this for you.

Ah, but the question is usually "can 5.56 be used in a 223?"... ;)

dmazur
July 7, 2008, 03:36 PM
Wikipedia does discuss 5.56 NATO / .223 interchangeability -

http://en.wikipedia.org/wiki/5.56x45mm_NATO

possum
July 7, 2008, 04:13 PM
Can .223 be used in 5.56?
yes.

i agree check out the ammo oracle link to ar15.com that will tell you everything that you wanted to know and then some.

gtmerkley
July 7, 2008, 07:04 PM
5.56 dont work right in a rifle made for .223

lmccrock
July 7, 2008, 07:23 PM
My DPMS 1:8 barrel is stamped "223" and 5.56 runs fine. Maybe DPMS has their own standard for finishing 223 chambers. I expect an AR barrel to run with both unless it was specifically chambered tight for match purposes.

That said, I fall back to my earlier post. The Wylde chamber will handle both.

Is the OP still listening? ;)

Lee

AR15barrels
July 7, 2008, 07:58 PM
Many DPMS 223 barrels have problems with 5.56 ammo.
I run a 223 Wylde reamer into them and they work fine afterwards.

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