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I'm a little confused. Aren't the .223 Remington and the 5.56 x 45mm NATO the same cartridge? Heavier bullets listed for the 5.56, is it because of barrel twist?
Actually, its the chamber of the rifle that is the determining factor.
5.56mm may use longer and heavier bullets and the chamber will have a longer leade or throat for this reason.
.223 ammo can be fired in a rifle chambered for .223 or 5.56mm, however 5.56mm ammo might not be able to be chambered in a rifle with a .223 chamber due to the lack of the leade.
Don't forget, the maximum pressure for 5.56x45 is higher than 223 Remington. A lot of cheap 5.56 is loaded to 223Rem pressure, but I wouldn't risk shooting any 5.56 in a 223 Rem chamber.
Heavier bullets listed for the 5.56, is it because of barrel twist?
You can probably get away with shooting 5.56 through a .223 barrel but I wouldn't try it. The cheap 5.56 is loaded light, but the M855 and 70+ grain stuff isn't.
Just a note, need to look at the manual that comes with the gun or the gun itself. I recently purchased a mini-14, while its sold as a 223, in the manual it states that it is fine to shoot 5.56 ammo also. I realize the OP didn't really ask that, but if someone looks at this thread might be helpful. Just my .02
John
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