Reloder 7 and 10x. I load 90 gr. Sierra and Speer HPs, 95 gr Barnes TTSX, and 110 gr Hornady V-Max loads, and which powder I end up with in these loads depends on the bullet and the barrel details. I load for a Wilson 1:10 SPC II chamber, and a ARP 1:11.25 5R DMR chamber, barrels. In the ARP barrel lighter bullets, get impressive velocity and accuracy with RL-7. In the Wilson barrel, RL-10x seems to be it's favorite across the board. I haven't experimented with many other powders, since these seem to get excellent accuracy at velocities near the upper end of safe.
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