5.56 vs .223

[Bayern]

Wills shooting .223 from a 5.56 AR do any damage or loss of accuracy? Sometimes I can get .223 cheaper than 5.56. And what about those off brand stuff from Romania,Russia, Brazil, Serbia etc. Is this ammo any good or questionable? Thanks for your help.

[markm]

Wont hurt anything. The ammo can be questionable. But generally won't hurt anything. Here's the 5.56/.223 tacked thread:

https://www.m4carbine.net/showthread.php?55149-5-56mm-NATO-versus-223-Remington-Chamber-Differences

[rdsii64]

To anwer your question, A 5.56 NATO chamber can safely handle up to 62,000 PSI. A .223 Remington chamber can safely handle up to 55,000 PSI.

With that said, A 223 Remington chamber is more accurate because it is tighter than a 556 NATO chamber.

Keep it simple and use a barrel with a 223 Wylde Chamber. A 223 Wylde chamber is chamber than can safely handle NATO pressure ammo while keeping the accuracy advantage of a standard 223 Remington chamber.
I only use Wylde chambered barrels.