Quote:
Originally posted by johngalt:
An interesting question.
I just bought some ammo, federal 5.56 XM193BK, which according to the research I've done, is higher pressure than .223 and should not be fired in a rifle chambered for .223.
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Gotta be careful with the "X" designator. That means it failed final inspection, and according to persons more knowledgeable than I, for the last couple years the failures are often pressure related.