Thread: .223 / 5.56 Brass Seperation
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Old 09-04-2015, 06:19 PM
Semper Fi 57 Semper Fi 57 is offline
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The reason for the two designations of the same case is 5.56 is a NATO designation in mm's whereas the .223 is American caliber for the same round. The difference is in the pressure loading in the original cartridge; As has been stated, DON'T fire 5.56 ammo in a weapon marked for .223.


Jim
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