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Old December 4, 2012, 01:43 PM   #14
Jim Watson
Senior Member
Join Date: October 25, 2001
Location: Alabama
Posts: 12,278
My perception is that the 5.56 chamber is cut for an automatic weapon shot hot, dirty, and with wartime ammunition that might be at the edge of specification on pressure and bullet profile.

I would not worry about shooting US peacetime 5.56 in a .223 chamber, but would avoid the imports that might not hew as closely to specifications.
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