Author Comment
Nick Ward
Moderator
Posts: 82
(4/12/01 8:05 am)
.223 vs. 5.56 ?
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Are these calibers the same?
I've recently read where they were different, like one's a civilian designation and the other is military, but that the 5.56 has been reconfigured to the same specifications as the .223.
I always thought they were the same thing, that maybe one was a NATO designation and the other a commercial one.
Anyone know the scoop on this? Thanks!
Nick
SKSseven
Administrator
Posts: 379
(4/12/01 6:12 pm)
Re: .223 vs. 5.56 ?
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there both the same round, juse one is Nato mesurements and the other is civvie 5.56mm nato .223 cal civ I guess it depends where you buy your ammo...
new ar guy
Registered User
Posts: 1
(4/13/01 11:52 pm)
Re: .223 vs. 5.56 ?
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That is not accurate. A 5.56 chamber is slightly tighter than a .223 chamber. Also, the bass on a .223 round is slightly thinner inside the neck area than that of a 5.56 round.
Shooting a 5.56 round in a .223 chamber may be dangerous. Some poeple have done so without problems and may continue to do so. But the chance exists the pressure of a 5.56 round shot in a tighter .223 chamber could become way too high. On the other hand, a slightly longer 5.56 chamber can safely shoot eitrher.
5.56 Ammo includes Winchester Q3131 and Q3131A, IMI M193 and M855, SS109 and about any military surpluss. There are more.
AR15 manufacturers who use the 5.56 chamber are:
Armalite built after mid 2000, before that are .223
Bushmaster, except their DCM
Colt
DPMS, even though they are marked .223
Wilson Combat built after mid 200, before that are .223
AR's which are .223 include
Olymipic Arms
M&A
Model 1
Proffesional Ordinance
Hesse
Victor Arms
Does anyone know what RRA is using? For more info check out AR15.com. Loads of people more qualified than me who could break it down very precisely for you there...
SKSseven
Administrator
Posts: 397
(4/13/01 11:57 pm)
Re: .223 vs. 5.56 ?
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good info! I did not know that, can someone produce a chart with excat mesurements? what about the south african battle packs I have been useing? I need more info on this topic. Don't want to screw up my rifles.
Edited by: SKSseven at: 4/13/01 11:01:45 pm
new ar guy
Registered User
Posts: 3
(4/14/01 12:10 am)
Re: .223 vs. 5.56 ?
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SA battle packs is military surplus and is 5.56, I will find the link with the specific charts and measurment differences and post later
SKSseven
Administrator
Posts: 398
(4/14/01 12:20 am)
Re: .223 vs. 5.56 ?
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that's what made me assume that it was only a difference in # due to military standards. all the surplus I get is 5.56, everything store brought is .223
mjmensale
Registered User
Posts: 1
(4/14/01 8:49 pm)
Re: .223 vs. 5.56 ?
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new ar guy wrote - "A 5.56 chamber is slightly tighter than a .223 chamber."
Close but backwards. A true mil-spec 5.56 chamber will be slightly looser than the .223 chamber. The military is looking for reliability over match quality accuracy. Which isn't to say a 5.56 chambered gun isn't accurate! Just more reliable feeding and extraction. After all, the military target is most likely shooting back at you.
Also, 5.56 ammo is loaded hotter than SAMMI specs allow for .223 ammo and will also include flash retardent in the powder.
Moe
chip3797
Moderator
Posts: 90
(4/14/01 10:41 pm)
Re: .223 vs. 5.56 ?
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I have a DPMS M-4 barrel. I shoot .223 is that wrong? TIA
chip3797
Nick Ward
Moderator
Posts: 102
(4/15/01 12:40 am)
Re: .223 vs. 5.56 ?
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This is all good info! However, I spoke with a gent tonight at my local ammo store and he said the .223 and 5.56 were the same, like the .308 and 7.62 are the same.
So now I'm wondering - are the .308 and 7.62 really the same? Or are their differences similar to those of the lighter caliber?
new ar guy
Registered User
Posts: 4
(4/15/01 1:46 am)
Re: .223 vs. 5.56 ?
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Whoops, youre right, I wrote that backwards. I should slow down when I type...
The DPMS is marked .223, but is really a 5.56. Like it says in the post, a 5.56 chamber will be absolutely fine with either 5.56 or .223, so you are just fine. A DPMS rep who moderates the DPMS forum on AR15.com wrote at least one of the reasons they mark their rifles .223 instead of 5.56 is because most people dont know what 5.56 is.
Including the guy at the ammo store you went to Nick. Most folks dont know the difference. The more I learn about guns the more I learn that listening to gun shop guru's is a mistake. Find out for yourself.
traevin
Registered User
Posts: 11
(4/15/01 4:26 pm)
Re: .223 vs. 5.56 ?
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As far as I know, a the calibers mentioned above are the same, or so close that you're just talking semantics. Go to any gunshop and ask for a box of .223 AND another box of 5.56mm (same with .308 and 7.62). See what they say (and how they look at you)
Nick Ward
Moderator
Posts: 108
(4/15/01 4:29 pm)
Re: .223 vs. 5.56 ?
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*LOL* New AR Guy, you are so right about the GSGs (gun shop gurus)! It's a tough lesson for a newbie to learn, that after you wade through all the machismo and hard sell attitude these guys are shoveling, most of the time all you have left is a bunch of BS and half-guesses
mjmensale
Registered User
Posts: 6
(4/15/01 8:52 pm)
Re: .223 vs. 5.56 ?
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"As far as I know, a the calibers mentioned above are the same, or so close that you're just talking semantics. Go to any gunshop and ask for a box of .223 AND another box of 5.56mm (same with .308 and 7.62). See what they say (and how they look at you)."
Same? No.
Close? Yes.
Semantics? Could get you hurt.
5.56mm NATO and 7.62mm NATO are military designations for the commercial versions of the .223 and .308 calibers respectively. The milspec ammo is loaded to higher pressures than the commercial (SAMMI) ammo. Also, the milspec chambers are cut to slightly different dimensions than the commercial chambers to accomodate the increased pressures.
Additionally, milspec 5.56mm ammo requires faster rifling in order to stabilize the bullet, especially the heavier 62gr M855 types, hence you find 1:9 or 1:7 twist barrels on military designated weapons. Most non-military barrels have 1:12 or 1:14 rifling.
Test it out for yourself. Load up four 30rnd mags with a variety of .223 ammo and run them through a 5.56 milspec gun as fast as you can. Your barrel will be smoking. They should all feed and extract without any problems - even that cheap Russian crap.
Try the same thing with four mags of real 5.56mm ammo (IMI M193 & M855, Win Q3131A, SS109, etc.). You probably won't make it through the first full mag before you encounter FTF/FTE.
Reliability and performance is what you want in a "social" rifle. For punching holes in paper it doesn't matter.
And if the clerk doesn't know the difference between milspecs and SAMMI-specs, he doesn't belong in the gun business, period. He will eventually get someone hurt or killed with bad advice. Find yourself a real dealer who understands "gun stuff."
Moe
traevin
Registered User
Posts: 12
(4/16/01 12:30 am)
Re: .223 vs. 5.56 ?
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Again, I am saying there is no difference between .223 and 5.56mm. This time I'm going to prove it so that no one else needs to worry about the ammo they're shooting. Same goes for .308 and 7.62, by the same; but right now, I decided to focus on the former.
mjmensale,
Would you please tell me where you're getting your information? As far as barrel twist, 1:9 (sometimes 1:7) is standard for every current AR15 producer, commercial or otherwise, not 1:12 1:14, like you think.
AR owners: how many of you have a different twist than 1:7 or 1:9? Most likely none, unless you have a 24" barrel. That should have been a good indicator that mjmensale was misinformed about a good many things he had to say in his post.
Also according to every ammo site on the net I've ever done business with, there is no difference between .223 and 5.56mm, including the SS109 and M855 mil-spec AP ammo you listed.
Why aren't these reputable ammo suppliers telling anyone that there's a difference? As one would expect, .223 and 5.56mm are used interchangably every single time. So what's the difference: other than bullet weight (55gr vs 62gr) there is none. And for your information, I've fired at least a case of SS109 and M855 mil-spec ammo without any FTF's, not just with 30 round magazines but also with a Beta C-Mag. And I don't have an M-16, just your average run-of-the-mill preban Colt AR15 chambered in .223 with a 1:9 twist. Again, any other twist would be considered an exotic.
Like I asked before, where are you getting your info? Show me where Colt, Bushmaster, Armalite, or Olympic Arms are producing standard 1:12 or 1:14 twist barrels? While you're at it, show me where it says you shouldn't run 5.56mm ammo through a commercial AR15 (non M-16) carbine or rifle. You do have a source, don't you?
Here's three examples that point to the fact that you are completely wrong. The ammo sites call SS103 and M855 .223/5.56mm, or simply .223, if you bother to check. Not one site calls it solely 5.56mm, which they would, for liability reasons, for one, if there was any difference, like you are claiming.
www.cole-distributing.com/
www.georgia-arms.com/varmint.htm
www.ammoman.com/
Maybe none of these ammo vendors "belong in the gun business," as you said. If you like I'll list some more established vendors just like the three above.
One thing about these boards is you encounter more misinformation than facts. I'd be happy if you're able to prove me wrong and will be glad to admit it. I expect the same from you. Good luck.
SKSseven
Administrator
Posts: 420
(4/16/01 12:40 am)
Re: .223 vs. 5.56 ?
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Mil Spec is 1 in 7" however most major manufactures use 1 in 9" look in your Bushmaster catalog it says it will stabilize most bullets up to 72 grains.
new ar guy
Registered User
Posts: 5
(4/16/01 12:56 am)
Re: .223 vs. 5.56 ?
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OK, OK, here a couple links that will put an end to the he said she said. They are not the same, period. they are almost the same and the following links will tell you what is up. Sorry it took me a day to find...
.223 vs 5.56 is at:
home.sprynet.com/~frfrog/...0mm%20NATO
.308 vs. 7.62 NATO is at:
home.sprynet.com/~frfrog/...me%20round
These links will explain the specific differences between both and are a lot more exact and precise than going into the gun shop and believing what the dude behind the counter says, which is in most cases, total crap.
traevin
Registered User
Posts: 13
(4/16/01 1:33 am)
Re: .223 vs. 5.56 ?
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Okay, that's Winchester, a single manufacturer. So if no one else made 5.56/.223, you would be right. Now read these articles that say .223 and 5.56mm is the same. I have about 130 more that say the same thing if you're interested.
www.fas.org/man/dod-101/sys/land/m16.htm
www.snipercentral.com/223.htm
www.firearmstactical.com/briefs26.htm
www.gunsworld.com/colt/m1...7xx_us.htm
members.nbci.com/neclipse...rifles.htm
new ar guy
Registered User
Posts: 6
(4/16/01 2:35 am)
Re: .223 vs. 5.56 ?
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Look, I am very sorry you seem to have a difficult time accepting they are different. The links I posted lists specificly, with diagrams, how the two are different. And what does Winchester have to do with the links I posted? The links you posted merely use the ".223/5.56" term interchangebly, they do nothing to say how they are the same, or even that they are the same at all. The fact is most people dont know what 5.56 is, which is why many places will write "5.56 (.223)" or something similar. In fact, it is for this very reason DPMS marks all their rifles .223 when they are in fact chambered in the larger 5.56. Using them next to one another in this way is so folks know that 5.56 is substabtially similar and in fact can usually be used in the same firearm. If you would like to continue this, please either post an article that shows that .223 SAAMI specs are the same as the 5.56 military specs. Just to recapp:
There is usually a difference in the interior dimentions of the brass; military (5.56) brass is a bit thicker, particularly at the case web.
Military 5.56 ammo is loaded to higher velocities and pressures than SAMMI-spec commercial .223.
Military 5.56 chambers have longer throats than do commercial .223 chambers, which reduces pressure.
You may have problems firing 5.56 ammo in .223-chambered guns because the short throats increase the already-higher pressures and can cause extraction and high-pressure problems.
There is NO problem shooting .223 ammo in a 5.56 chamber.
Ammo that is loaded to max pressure is rarely using the most accurate load for that cartridge, and most match ammo is downloaded to some degree for accuracy reasons.
Unless you can come up with specific arguments against the above info, with data to confirm such arguments, I dont see how you can continue to say they are the same.
traevin
Registered User
Posts: 14
(4/16/01 9:09 am)
Re: .223 vs. 5.56 ?
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www.ar15.com/forums/topic.html?id=12825 Yes, I know where you got your data from. The same article that says standard rifles have a 1:12 or 1:14 twist. Do you really believe that? Where did they come up with that number???Check your AR's rifling. Check your friend's AR. Go to your local gunshop and see how my AR's have such a high twist rate. At least that part of the info from your article just isn't true. Typical AR's have either a 1:7 or 1:9 twist, easily capable of handling 62gr. mil-spec AP ammo. Show me just one brand that gun-maker that has 1:12 or 1:14 twist as the standard. You're talking about me finding source material when what you use doesn't even know the proper twist for commercial AR15's. Check here and see what these guys consider standard on AR's:
www.jtdistributing.com/
The difference is so small that the gun-makers don't even bother to classify the calibers as anything but the same. If it were seriously harmful to use 5.56mm in a .223, there would be warnings labels saying as much since it would be a liability issue and there's not. Plus, I've, (and a lot of other people) been shoot mil-spec ammo for years without any problems. As I said on my original post, the difference is negligible, unless you have an oddball AR with a 1:12 or 1:14 twist. Do you agree, now?
chip3797
Moderator
Posts: 95
(4/16/01 9:19 am)
Re: .223 vs. 5.56 ?
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i have a 20" A1 barrel with a 1:12 twist. just thought i'd share. anybody else?
chip3797


