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My Sierra book shows IMR4350 and 760BR as the powders I would prefer, in the "stock" 6mm Rem.
They show a load with Rem 9-1/2 primer, 60-gr Sierra HP, and MAX 48.9 gr of 760BR as giving 3,700fps from a 26" barrel.
Best I can do ya, but it really sounds as if you already have the situation well in hand.
Sounds like a fun-gun!
Art
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