That looks like a good set up. My go to powder is N560 but have also used IMR4831 and R22. All are good. Target velocity 2,800fps. The SD of 140 grn 6.5 is so high Ive never seen the need for anything but cup and core projectiles. Im still using 140 grn Amax through my x55 and they often pass through and always kill 'em good. Waiting in the wings are 140 grn Speer Gold Dot - have used a few and they kill them proper too. They shoot 1.5" lower than the Amax.
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