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File:Two 223 Headstamps.jpg - Wikipedia

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Thunder Basin Brass

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5.56×45 « Daily Bulletin

Processed 223/5.56 Once Fired Bulk Brass Mixed Head Stamp

223/5.56 1500 count – Cleaned & Polished mixed head stamp range brass – RWBrass & Supply

55gr 5.56 NATO and .223 Remington Ammunition Comparison –