I shoot the 6mm BR Norma casually so I can't advise substantively--the only thing I can say is exercise caution with the nomenclature of 6mmBR--it actually encompasses lots of different incarnations and renaming of the original cartridge so you need to be sure your components and gages are all on the same page.
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"Everyone speaks gun."--Robert O'Neill
I am NOT an expert--I do not have any formal experience or certification in firearms use or testing; use any information I post at your own risk!
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