Greetings @rimubay,
I would use AR2206H. As mentioned elsewhere I tested 42.5 grains of AR2208 with 140 grain Corelokt projectiles in a 7mm-08 which gave 2,710 fps in a 19" barrel. One grain less of AR2206H (41.5 grains) should give about that velocity and one grain more (book Max) about 2,750 fps. Work up with a chronograph in a couple of steps to verify the velocities though.
Regards Grandpamac.
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