Quote:
Originally Posted by SavageEagle  Ok but that's sort of confusing. How is that possible? and what is the better of the two, interchangability aside? |
They are essentially the same caliber. 5.56 = the NATO standard version of .223 Remington. The difference being that 5.56 has a slightly longer throat to the chamber. A .223 chamber could cause a high pressure situation if 5.56 ammo is shot through it. 5.56 is also slightly higher pressure.
Since the 5.56 chamber is the looser of the two, it is safe to shoot .223 through it.