View Full Version : 5.56-.223

Cen Cal Gunner
05-19-2011, 3:53 PM
Might be a stupid question but you wont know if you dont ask, what are the differences between the 5.56 and.223 been doing a lot research picking up my lower Wednesday for my first AR build. Im a nubee to CALGUNS and I have to say it ROCKS!

05-19-2011, 3:55 PM
5.56 is what the military uses. .223 is loaded to lower pressures and velocities as compared to 5.56x.45.

Put a 5.56 round next to a .223 round you'll notice the 5.56 is a tiny bit longer.

Cen Cal Gunner
05-19-2011, 4:00 PM
Is it as easy to obtain as .223 and is there a price difference?

send it_hit
05-19-2011, 4:00 PM
welcome to the forums... i am by no means an expert but from my understanding the main difference is the pressures. 5.56 exherts more barrel pressure than the .223... because of this its not generally advised to fire a 5.56 round from a .223 dedicated firearm, but .223 in 5.56 is gtg.

send it_hit
05-19-2011, 4:01 PM
they should both be readily availabe, as they're probably the most popular round out there atm...

again, no expert, but i believe you can find surplus 5.56 for a little cheaper than .223, but i think their price is pretty comparable. unless you're buying super high end match ammo or something...

05-19-2011, 4:03 PM
you can shoot .223 out of a 5.56 chamber but not the other way around

05-19-2011, 4:04 PM

First answer you would have received would be to do a search. Hahaha, this is the baptism by fire for all noobs.

However, I'll give you a short and sweet answer to get you going without going into too much detail.

- 5.56 looks and outside measurements are pretty much identical to .223.
- .223 in most 5.56 barreled AR's are safe to shoot.
- Not the same for 5.56 ammo. You cannot safely shoot 5.56 ammo in .223 barreled AR's.

Main difference between 5.56 and .223 is that the 5.56 round has higher load pressures. This can be unsafe in .223 specific barrels.

Too be safe stick with .223 unless you are sure your setup can take on 5.56 ammo.

05-19-2011, 4:04 PM
Yes NATO has higher pressure than SAAMI and it has thicker primer cups and thicker case walls. Dimensions are more or less the same, there may be tiny variances. But that stuff is so small it really doesn't matter. The difference is more in the chambering. With regard to chambering the danger is the leade, leade is the distance between the mouth of the cartridge and the point at which the rifling engages the bullet.

05-19-2011, 4:06 PM
Checkout this website. The menu on the left hand size of the page will keep us busy, and tell us more than most of us need to know about the 5.56 NATO & .223Rem.



05-19-2011, 4:11 PM
What sucks is how often i hear the "experts"/gun dealers telling people otherwise. Every gunshow I hear someone ask that question to a dealer and they all say its the same exact round with no difference what so ever other than the name. That they are all interchangable. It surprises me how little many of these dealers know.

Cen Cal Gunner
05-19-2011, 4:23 PM
Thanks for the info n link guys question answered