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That's easy enough, take a magnet with you. Copper wash projectiles, and or cases can be sorted with a magnet. I'm not sure with steel core, that depends on how thick the jacket is, but if I had to venture a guess a good magnet would stick.
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NM M1A, HK Mk 23, Benelli M4, Ar-15 Lower,
CZ 2075 RAMI (P) 9mm, Barrett MRAD .338LM
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