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223 vs 556


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#1 OFFLINE   cwd500

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Posted Jul. 11 2008 - 05:27 PM

what is the difference between the223 and the 556 and which is better


#2 OFFLINE   XHairs

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Posted Jul. 11 2008 - 05:39 PM

I'll start with some basics as I'm no ammunition aficionado.
.223 is loaded to SAAMI specs. 5.56 is loaded to NATO specs and is generally 'hotter'.
There are some dimensional differences of the case. You can fire either through a 5.56 chamber or a .223 Wylde chamber. Don't fire 5.56 through a .223 SAAMI chamber.

Better? It depends on application, bullet weight, etc. What you going to use it for?
I use some reputable .223 for targeting. 5.56 are in cans for zombies.

More knowledgeable folks will chime in.


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#3 OFFLINE   TigerStripe

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Posted Jul. 11 2008 - 06:32 PM

XHairs pretty much nailed it. Only fire .223 in a .223 marked upper. If you get a .223 Wylde chambered barrel, you'll most likely know it but if you're unsure don't fire 5.56mm out of one that you're not sure of.

The internal dimensions of a 5.56 case in smaller because the walls are thicker to withstand the difference in pressure caused by the hotter load. A 5.56mm chamber is looser than a .223 chamber for the same reason, the hotter load makes the case to expand more.

I could keep writing things but XHairs explained it very well.



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#4 OFFLINE   XHairs

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Posted Jul. 11 2008 - 08:43 PM

The internal dimensions of a 5.56 case in smaller because the walls are thicker to withstand the difference in pressure caused by the hotter load. A 5.56mm chamber is looser than a .223 chamber for the same reason, the hotter load makes the case to expand more.



TS


There - I just learned something about ammo, too. Thanks, TS.


#5 OFFLINE   cwd500

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Posted Jul. 11 2008 - 09:49 PM

i am safe to shoot 223 out of a 556 chamber


#6 ONLINE   rasputin

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Posted Jul. 11 2008 - 10:01 PM

i am safe to shoot 223 out of a 556 chamber


Yep, but not vice versa.


#7 OFFLINE   TigerStripe

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Posted Jul. 12 2008 - 02:08 AM

There - I just learned something about ammo, too. Thanks, TS.


I didn't teach you much, you were right on the money. Thanks for the thanks thought! :thumb:



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#8 OFFLINE   toolboxluis

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Posted Jul. 24 2008 - 02:22 PM

.223 is more for civilian use so its less hoter to run on your ar but the 5.56 is alot hotter but more reliable

so if you own an ar that uses .223 stick to that bad idea if you use 5.56 round becose it mite mest up the ar or worst
but if you own an ar that can chamber both 5.56 or .233 you can have the best of both worlds


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#9 OFFLINE   kestrelman

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Posted Jul. 28 2008 - 02:43 PM

OK, my question here is how do you know for sure if you can fire 5.56? I have a Rock River Arms AR-15 I bought recently. The lower receiver says 5.56, but I've heard you can't always rely on that. I've looked on the barrel under the handguards and can't find any markings to confirm if it's 5.56 or .223. I have contacted the company by email but haven't heard back yet. From looking at their website everything is labeled 5.56/.223, so I'm assuming I can fire both, but I want to make sure. Can anyone give me any advice?

Edited by kestrelman, Jul. 28 2008 - 02:45 PM.



#10 OFFLINE   hsracer201

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Posted Jul. 28 2008 - 03:08 PM

OK, my question here is how do you know for sure if you can fire 5.56? I have a Rock River Arms AR-15 I bought recently. The lower receiver says 5.56, but I've heard you can't always rely on that. I've looked on the barrel under the handguards and can't find any markings to confirm if it's 5.56 or .223. I have contacted the company by email but haven't heard back yet. From looking at their website everything is labeled 5.56/.223, so I'm assuming I can fire both, but I want to make sure. Can anyone give me any advice?



if it says 5.56 then you can shoot them both, becuse .223 is less powerful than 5.56.

if it says .223, then only shoot .223 and stay away from the 5.56. :thumbsup:


#11 OFFLINE   kestrelman

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Posted Jul. 28 2008 - 03:19 PM

if it says 5.56 then you can shoot them both, becuse .223 is less powerful than 5.56.

if it says .223, then only shoot .223 and stay away from the 5.56. :thumbsup:

I kinda figured that, especially since I bought the weapon new and it was put together by RRA. So, I'm assuming then that if you buy a new weapon never fired from a manufacturer, if the lower says 5.56 you can fire both 5.56 and .223, but if the lower says .223 you can only fire .223? I've never seen one that says .223 on the lower, but that isn't saying much. :laugh:


#12 OFFLINE   TigerStripe

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Posted Jul. 28 2008 - 04:17 PM

I just checked Rock River's website. All of their uppers will handle 5.56.


TS


:welcome:

Edited by TigerStripe, Jul. 28 2008 - 04:17 PM.



#13 OFFLINE   redbarron06

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Posted Jul. 29 2008 - 04:22 PM

I just bought a used AR from a gun shop (it was a build job) and the upper is not stamped at all with a caliber. The end of the barrel however is stamped 5.56mm. Correct me if I am wrong but I should be OK shooting the 5.56 because the chamber is part of the barrel or is there something in the upper reciever that I need to be worried about?


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#14 OFFLINE   TigerStripe

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Posted Jul. 29 2008 - 04:30 PM

I just bought a used AR from a gun shop (it was a build job) and the upper is not stamped at all with a caliber. The end of the barrel however is stamped 5.56mm. Correct me if I am wrong but I should be OK shooting the 5.56 because the chamber is part of the barrel or is there something in the upper reciever that I need to be worried about?


If the barrel is stamped 5.56mm, it will handle 5.56. As you said the chamber is part of the barrel.


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#15 OFFLINE   redbarron06

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Posted Jul. 29 2008 - 05:54 PM

great :gun3: :gun3: :m4: :thumb:


#16 OFFLINE   msmyth

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Posted Jul. 30 2008 - 03:46 PM

Pretty well covered, but, a 223 Wylde will handle 223 and 556. 556 will handle 223. 223 only safe with 223.


#17 OFFLINE   helotaxi

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Posted Aug. 01 2008 - 10:10 AM

.223 ARs are the exception. Most are built for 5.56. Accuracy will suffer slightly using .223 in a 5.56 chamber but it isn't horrible.


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#18 OFFLINE   TigerStripe

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Posted Aug. 01 2008 - 11:56 AM

It's hard to get a strict .223 Remington AR these days. Almost all are 5.56 or .223 Wylde...


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#19 OFFLINE   helotaxi

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Posted Aug. 02 2008 - 05:13 AM

Doesn't DPMS have a whole series of .223 chambered ARs? Are they a Wylde or SAAMI chamber, cause I can't seem to find the answer to that one?


#20 OFFLINE   TigerStripe

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Posted Aug. 02 2008 - 02:12 PM

Doesn't DPMS have a whole series of .223 chambered ARs? Are they a Wylde or SAAMI chamber, cause I can't seem to find the answer to that one?


The DPMS .223's have .223 SAAMI chambers. I should have added that in my previous post.


TS





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