By now you probably already know that .223 Remington and 5.56 X 45mm are the same shell. Well, actually, they are not. One has a thicker brass and a little more combustion pressure, but as far as fitting in your rifle, headspace, etc., they are the same. Just don’t try to fire a 5.56 x 45mm shell in your rifle if it is chambered for .223 Remington. Firing a .223 Remington shell in a rifle chambered for 5.56 x 45mm is okay though.
This ammo can come in a military style tin in 500 round amounts similar to the picture. it is a good ammo to stock up on if you have a traditional AR-15.
I have located a place where you can still get this in the Wolf ammo 500 round tins. It is 55 gr. Full Metal Jacket and you can pick it up here.
