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Only bad thing about the once fired LC mil brass is that the crimp has to be removed.
MM
Having gone through that with over 1800 pieces of once-fired range brass, I found that to be true with every .223 and 5.56 type of once-fired brass I had.
Hornady, Speer, W-W, PMD, Federal, LC and some others. Primer pockets ahd tobe swaged and beveled. All had circular crimps.