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Old December 3, 2012, 09:59 AM   #12
Senior Member
Join Date: April 18, 2011
Location: Rhode Island
Posts: 324
I my experience, I would not fire 5.56 out of a .223. Simple test. Drop a 5.56 into a true .223 barrel, flip the barrel upside down. Does it drop? Can you remove it with your finger? Or did you have to "help" it out. Well it's most probably the latter.. 5.56 does stick a little in a .223 barrel and that would worry me if I expected to have perfect performance. Will it work? Sure it will. But just because it can, does not mean you should IMHO. And the previous response of the case of a 5.56 being ever so slightly larger is correct. Check the case specs. Last time I did, there was a difference.
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