I've been using RL16 with 127gr LRX, 140gr Accubond, and 143gr ELDx pretty much exclusively. I've put a lot of H4350 through my RPR, and tried it in the Montana, but the accuracy was about the same as RL16 (good) and velocities were lower. My load for the 140gr ABs and 143gr ELDxs is 42.5 gr, I worked up both loads separately, just seems to like that weight.