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Message: <blockquote data-quote="dennishoddy" data-source="post: 2608578" data-attributes="member: 5412">Unless your shooting bulls eye, or bench rest, mixed head stamp brass is ok.The 5.56 brass is a little thicker, so if your going for compressed loads like I use, you'll hear a little crunching, but it doesn't hurt anything. I'm shooting with an AR. I have three in the .223 or 5.56, they all shoot just about the same. I'm not a paper puncher. Not steady enough, but I can hold a fair group with my loads.If your into max accuracy, you will want to separate your brass by head stamp, and if its original cal was .223, or 5.56. Size them to the same length, etc, to make a consistent case. Then its up to the powder/primer/bullet combo.</blockquote>