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Old February 8, 2013, 04:32 PM   #2
PawPaw
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Join Date: December 24, 2010
Location: Central Louisiana
Posts: 3,112
Cheaper Than Dirt says no.
Quote:
The primary differences between .223 Remington and 5.56 x 45 mm (NATO) are that .223 Remington is loaded to lower pressures and velocities compared to 5.56 NATO and the 5.56 NATO chamber has a longer leade. .223 Remington ammunition can be safely fired in a 5.56 NATO chambered gun, but the reverse can be an unsafe combination. The additional pressure created by 5.56 NATO ammo will frequently cause over-pressure problems such as flowing brass, difficult extraction, or popped/punctured primers, but in extreme cases, could damage or destroy the firearm.
Additionally, SAAMI also says that we should not use 5.56 military ammo in rifles chambered for .223 Remington.
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