Check out Vv N165. I heard that some of the long range 6.5-284 target shooters were using it and it worked great for me. I could beat the velocity with RL-17, but not the accuracy. With the turret, I don't need a slightly flatter trajectory, I need pin point accuracy.
Superperformance is reportedly good in the short mags. I read somewhere that it burned pretty dirty, so I don't know. The Ramshot powders are good and reportedly burn clean. I guess Magnum would be the one I would try in that gun.
