I've never thought much about. Different , but the same. I do believe a rifle stamped 5.56 is considered a military weapon under US export regulations. Good video covers about everything. I've used lots of reloaded 5.56 brass, of course you have to remove the primer crimp.
https://www.youtube.com/watch?v=VCS4fXFmCyA
Grizz
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"Indeed, no human being has yet lived under conditions which, considering the prevailing climates of the past, can be regarded as normal."
John E. Pfeiffer The Emergence of Man
written in 1969
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