Keyword Analysis & Research: 556 round

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Is 223 and 556 the same ammo?

Short and sweet: the 5.56 and the .223 are the same bullet (.224 diameter) but the brass case and primer are different. The brass is thicker on the 5.56 and the primer is less sensitive. yes, the 5.56 is loaded to a slightly higher pressure, but not a significant one. So, you can safely fire .223 in a 5.56 chamber.

Why does military use 556?

The 5.56 mm (NATO) round was developed in the ongoing trend since WWII to equip soldiers with intermediate sized rifle rounds (that bridged the gap between full rifle and pistol/submachine gun). The intermediate sized round also allows the soldiers to carry more ammunition. Using a smaller (diameter)...

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