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cr5 is it the .223 77 gr Blackhills they still carry, or actual Mk262 5.56? I know they crono'd the .223 and its pretty close to spec'ed Mk262, but....
Handload a 77 SMK or Nosler OTM bullet.
I'm partial to using Ramshot TAC and Federal 205m primers, but there are more than a few primer and powder combos that will get you there.