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Old February 8, 2013, 04:32 PM   #2
Senior Member
Join Date: December 24, 2010
Location: Central Louisiana
Posts: 3,137
Cheaper Than Dirt says no.
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.
Dennis Dezendorf
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