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Posted: 7/15/2007 6:04:28 PM EDT
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For comparison the round on the left is a .223 and on the right is a 5.7x28. The round in the center was just empty brass I found at the range and I stuck a .223 bullet in it for size. The headstamp says R-P 30 CARB. The primer looks like its ready to pop out What is it?  
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