Closest I have to your 6x47 is my 6mm Creedmoor with 20in. 9tw Proof CF barrel. I shoot 70gr Nosler BT's in that with RL16 and it stacks them in to tiny little groups and I couldn't be happier with it. Also have a 6-284 with Lilja 26in 12tw and it shoot 75gr Vmax just as well.
Of the powders you have I'd probably try Varget first.
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