This is what I had concluded after lots of reading. I have been HBN coating all the bullets through this rifle and think I may get more velocity with RL-50 if I didn't because I can't get enough powder in the case. RL-33 gives me the same velocity with a 375 grain bullet with a little less powder and almost compressed.No.
RL50 is double based. You should exceed H50bmg velocities with RL50.