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I own two firearms in this caliber range. One is an SAR-3 AK chambered and marked for 5.56 NATO, the other is a MINI-14 that is marked as chambered for the .223, however the owner's manual clearly states that it is safe to fire 5.56 NATO in the rifle. Thus, I fire either one in both and have for some time with no troubles.
As to other types of firearms, I can't say. I just know either one works in mine.
As to the brass question, military brass is definately thiker than most commercial brass. Thus the inside dimensions are reduced. It's not as noticeable with the 5.56, but put a military 30-06 or .308 case in the press to resize and then do a commercial case and you can feel the difference. It is also visibly apparent when looking at the case on end.
That is not to say that all commercial cases are thinner, some may not be, but most are in my limited experiece.
I have some 5.56 cases and some .223 cases downstairs that are made by the same manufacturer. I bet the 5.56 cases are heavier. I'll have to weigh them and see.
Take care.
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When you've got 'em by the balls, their hearts & minds will follow. Semper Fi.
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