5.56 vs. 223: What's the Difference? 

So bottom line; better to have your AR chambered in 5.56 so you can swap between the two?

never had a jam shooting 223 out of my 556

More clearly, some heavier bullets in 5.56 loadings can increase the pressure above .223 guidance when fired in .223 chambered rifles. Ruger "always" stated their mini-14 was suitable for either .223 or 5.56 ammunition.

Thanks! I was wondering why my face/hand hurt after shooting my 5.56 out of a 223. 😅

Just ordered my 7.5 ss 556 makes my 3rd build hopefully I can get a 300 blk next

I’m Wylde about BCA.

I shoot both 223 and 556 out of both of my 223 AR-15 with zero issues

The BCA15 "Endure" in .223 wylde I bought took two RMA trips to BCA because of the chamber. rounds jammed into the lands up to the shoulder on the case. I don't know how they resolved it , but since getting back the second time, I have successfully fired 250+ rds of 5.56 NATO 62gr and 77gr with 2ish MOA consistently 100 yards from bench or prone position. I'm quite happy with it now. The American Black Walnut furniture is the envy of shooting range.

Good to know if you didn't know. Some out there might not know👍👍

But that depends on what testing method they are using. Epvat and scatp are somewhat similar but yield more similar results to SAAMI

Thank you

The difference between 223 and 5.56 is in the CHAMBER, not the round. The round itself is identical except for the radiused shoulder to neck transition on 223. Go look up the technical specs

From what I understand is that basically the case neck were the projectile meets the brass is .01 larger on the 5.56 and the swelling of the brass on combustion is what could create a ejection issue on the .223 round.

I love the fact that you condensed this into a "short". My understanding is that most newer .223 firearms can still safely handle the micro-slight differences in pressure with 5.56. But you're stating "cycling issues" and not specifically that the thing will blow up. Am I correct in what my understanding is? ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--fmcdaAOkY4.html

Will the 223 shells eject properly out of a 556 ?

Only freakin video that explains my situation. I just got my brand new Smith & Wesson M&P AR pistol yesterday. I went to the gun range today with 200 rounds of 223 ammo the gun would fire one round and then click nothing luckily the gun range had an on-site gunsmith whom looked at the gun and told me that if I put in 5.56 it will have no issue to run a few hundred rounds of that first to loosen up the gun and then maybe it'll fire the 223. He says the 223 does not have enough gas to push the bolt back. I purchased 100 rounds of 5.56 The gunshot all 100 rounds like it was nothing. I never had these issues with my AK. The gun fires great I think it's a good toy to keep around but if I have a real threat in my home I'm definitely going for my AK-47 I've had it for 20 years it has never had any misfire with any ammunition I put through it It's only been cleaned once in 20 years and that thing fires like there's no tomorrow I'm no gun expert I could care less about the online disputes between guns I just know from my own experience with my AK-47 Mac 90 that sucker has never had an issue

Just bought your 223 Wylde rifle that was on sale for a beautiful price of 350 perfect quality company

It's actually not bad

I was was told that if the AR-15 shoots 5.56 it can also do 2.23 is that right or wrong?

Is there a difference in how they shoot or accuracy or velocity or anything? I cant find any explanation that addresses if there’s a difference in those when comparing

Ive never had a problem with mine bca always done right by me

What about grouping, or pressures?

I use range dynamics 223 ammo in my 5.56 no problem

I love bca, I have a couple of their offerings. However I've seen that the 223 Wylde tends to be problematic. Is there any reason for this? Why would someone choose Wylde over 5.56 NATO?

Let's talk about how the roll pin ejector on your complete 556 upper keeps breaking after 100 rounds and I don't even send it back for you guys to fix anymore I just fix it myself, it's happened so much. I ordered an adjustable gas block. Guess who I ordered it from? Not you! 😂

This is false, 5.56 and .223 were measured in different ways, recently they were both tested in exactly the same way, and guess what? The pressure is nearly identical and not enough difference to make a difference. I've fired thousands of 5.56 through .223 rifles and zero problems. This horse has been beaten for decades and not one single solitary documented incident of a 556 causing any sort of issue beyond maybe a tight extraction in a very tight chambered rifle, once again this myth is being propagated for whatever reason.

Do bca uppers still explode

I have shot 5.56 through my mini-14 for years! No problems ever. Guess I was lucky.

So tired of hearing people say 556 is loaded to higher pressure...which is not true..first..556 pressures are measured differently..second..military ammo has thicker cases which leads to smaller internal diminsions which then leads to a higher pressure with the same powder loads.. why is this confusing...

So if a firearm is marked 556/223 Will one type of ammo be more accurate than the other in that particular firearm?

Just buy a 5.56 barrel, the wylde chambering is a stupid gimmick.

Hi Klopp how are you?

Original caliber : 223 by Eugene STONNER 5.56 : US army modification for Vietnam war

You kinda look like Paul Giamatti lol

From my experience 223 jams 556 never jammed , ran like butter

Does anyone have any actual experience with a failure from using the wrong ammunition in a 223 AR?

I’ve been wondering the answer to these two questions. I appreciate your time and effort in getting this battle rifle newbie enlightened. Now, what about 762/308 rounds. Is it the same?

People loss their shit over this topic and its hilarious, there is usually two camps, camp one say they are the same, camp two says they are completely different, but the truth is "Same Same but Different." They are similar with a few important differences.

So where on your barrels is it stamped? I got a BCA full upper with the side charging handle. Took it home and 1st round shot ok, 2nd round the shell jammed, cleared the shell, next round did the same thing only this time it was a pain to get the shell out. I was told it was a .223/5.56, but clearly it may be a .223 Rem only, but there is no stamp I can see on the barrel anywhere. Can you help me out here? I really don't want to shoot this or sell it to anyone due to not knowing if the next time it will be catastrophic failure, I don't want myself or anyone getting hurt. Customer service doesn't answer so thought I'd try YT. Thank and another issue was the side charging handle kept coming loose. Love the idea but dang!

5.56 isn't really that "much" hotter. It's not loaded any "hotter" actually. The only difference is the case wall thickness. Makes the chamber pressure slightly higher. Minutely...

There are no dimensional differences. The difference is in the neck of the barrels. And also in pressure testing. Higher pressure in a 5.56, but NATO also tests casing pressures in a different location. Thats why you assume there may be cycling issues, but really there's not, unless you're using a BCA, which can't cycle anything reliably.

MM77 👍🏼👍🏼 Approved……………………..Ok, I think this horse is dead now. 🤯LOL!

there are 0 differences between the 223 & 5.56 cases ZERO DIFFRENCES !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Have no issues shooting 223 out of any of my 5.56Nato rifles. 🤔🇺🇸🇺🇸

Nope!!! 5.56 is NOT a hotter round. 5.56 and .223 overlap significantly in charge loads. Do some thorough research and you'll find the only real difference between the two is how and where they are measured for pressure!!! I have fired plenty of 5.56 ammo in rifles chambered for .223 and everything was just fine!! Might have to seat a couple 5.56 rounds a little deeper but that's not a big deal. Check Lucky Gunner/Ultimate Reloader for details.

All this energy could be spent fixing those junk firearms you sell.

🤦🏾‍♂️🤷🏾‍♂️

223 wild chamber is a waste of money. . .

What about the BCGs? Do you have to change them in between the 5.56 & 223 ammo when you run the wild barrel? Or will my BCG that’s 5.56 run the 223 ammo I have?

.223 has more powder than 5.56.. Hate to burst your bubble its been debunked