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Plated bullets have a reccomend "do not exceed speed". Off the top of my head I couldn't tell you what that is but Berries will list it. You'll have to look up the load in your Manuel to see if you'll cross that threshold.
A BHN of 12 is low to medium in lead hardness. typically you'll want a 16-18bhn for the higher velocity stuff. With that said, barrel fit is king, if the bullets fit properly you may be able to push them harder and not see any leading. My suggestion is to start of slow and work your way up.
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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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