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View Full Version : 5.56 in a 223 REM box


GlockBlocker
09-09-2010, 11:19 AM
I ordered a couple boxes of Sellier & Bellot 5.56 from Cheaper than Dirt. On the site it was advertised as 5.56x45 and only a picture of a round.

They came to me in a box labelled 223 REM. On the rounds themselves, they are marked 5.56.

I guess it's no big deal for my purposes, but couldn't that possibly cause a problem if someone had a 223 rifle and saw this box on a shelf?

Corbin Dallas
09-09-2010, 11:57 AM
Yes, if your rifle is chambered for 223 only, the 5.56 will present issues.

My concern would be for case pressure and possible out of battery problems. The 223 rem chamber was not designed to handle the 5.56 case pressure.

evolixsurf
09-09-2010, 12:31 PM
you should definately call them and tell them this. Thats not cool... I woudlnt want to be next to the guy at the range shooting that out of his .223.

dieselpower
09-09-2010, 12:39 PM
Are you sure its not .223 with a 5.56 stamp?

rero360
09-09-2010, 1:04 PM
In reading through my Sierra reloading manual, 5th edition, they say that there is no difference between the two, and that the only difference is the crimp put on military brass.

In fact, the fastest military 5.56 round only travels at roughly 3,100 fps, where according to sierra, one can safely push rounds (40gr. pills) up to 3,600 fps. One can also argue that those shooting the super fast light bullets, and those who are pushing the heavier bullets, like the 80gr SMKs, at the high end are getting higher chamber pressures than military ammo.

I personally have a Wylde chamber on my AR and have shot 910 rounds of military surplus thru it so far without a problem, along with boxes of BH match grade ammo and some wally world fodder.

I hold that 5.56 is perfectly safe to shoot out of a modern .223 firearm that is in good condition. Now the higher pressures may wear parts out faster than shooting factory loaded .223, so you'll only get 100,000 rounds down range before having to rebarrel apposed to 120,000 or what have you. Its not going to make a quality rifle grenade.

GlockBlocker
09-09-2010, 1:50 PM
No, I don't know if it's .223 with a 5.56 stamp. I guess since it's an online site, no one is going to just pick up a box based on what it says. They do advertise it as 5.56.


Here's the item:

http://www.cheaperthandirt.com/ItemDetail.aspx?sku=61906


and here's some pictures:

http://www.calguns.net/calgunforum/attachment.php?attachmentid=68128&stc=1&d=1284065358
http://www.calguns.net/calgunforum/attachment.php?attachmentid=68129&stc=1&d=1284065372

Corbin Dallas
09-09-2010, 3:23 PM
In reading through my Sierra reloading manual, 5th edition, they say that there is no difference between the two, and that the only difference is the crimp put on military brass.

In fact, the fastest military 5.56 round only travels at roughly 3,100 fps, where according to sierra, one can safely push rounds (40gr. pills) up to 3,600 fps. One can also argue that those shooting the super fast light bullets, and those who are pushing the heavier bullets, like the 80gr SMKs, at the high end are getting higher chamber pressures than military ammo.

I personally have a Wylde chamber on my AR and have shot 910 rounds of military surplus thru it so far without a problem, along with boxes of BH match grade ammo and some wally world fodder.

I hold that 5.56 is perfectly safe to shoot out of a modern .223 firearm that is in good condition. Now the higher pressures may wear parts out faster than shooting factory loaded .223, so you'll only get 100,000 rounds down range before having to rebarrel apposed to 120,000 or what have you. Its not going to make a quality rifle grenade.


Your manual is wrong. 223 and 5.56 are similar, but not the same.

http://www.cheaperthandirt.com/MediaPages/ArticleDetail.aspx?mediaid=316

Wylde chambers are GTG with 223 and 556 rounds. 223rem chambers are NOT GTG with 556.

dieselpower
09-09-2010, 3:54 PM
Need to measure the ammo, I am thinking that is .223 with a 5.56 stamp

Fjold
09-09-2010, 4:14 PM
Need to measure the ammo, I am thinking that is .223 with a 5.56 stamp

The ammo will measure the same. The difference between the two is that Nato has a higher pressure limit for the 5.56 than SAAMI has for the 223 and the leade of the 5.56 chamber is longer than the 223 chamber.

MoBait
09-09-2010, 4:31 PM
I don't reload but i know for a fact that my .223 Federal wal mart cartridge is shorter than my Federal AE 5.56 cartridge. Both loaded with 55 grain bullets. The neck seems to have a sharper angle on the 5.56 as well. And the felt recoil is greater with the 5.56.

PyroFox79
09-09-2010, 6:08 PM
Maybe the manufacturer ran out of 5.56 boxes and used 223 in a pinch. Just a thought.

neal0124
09-09-2010, 7:46 PM
It is labeled m193 on the upper left corner of the box. Are the primers crimped in? It's hard to tell with that pic.

GlockBlocker
09-09-2010, 7:52 PM
It is labeled m193 on the upper left corner of the box. Are the primers crimped in? It's hard to tell with that pic.

i don't know how to tell.

sevensix2x51
09-09-2010, 7:56 PM
i don't know how to tell.

use the macro setting on your camera, and move back about 8".

GlockBlocker
09-09-2010, 8:16 PM
ok, this is the best i can do with this camera:

http://www.calguns.net/calgunforum/attachment.php?attachmentid=68147&stc=1&d=1284088576

neal0124
09-09-2010, 8:55 PM
They don't look crimped. They are labeled m193 though. Without crimped primers they are probably not loaded as hot as nato rounds. Not sure though, just a guess.