Different 6x47, man. 6mm-222 Rem Mag, be very similar to 6mm-204.
I wouldn't use anything with a boltface the size of 6.5 lapua in an AR15 anyway. There are plenty of reports of longevity issues even with 7.62x39 bolts, it's designed for the .223/5.56 case, shoehorning larger cases in requires removing metal that is supposed to be there.
Get an AR10 platform and you're onto something (losing many very expensive cases is what you're onto)
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