Quote Originally Posted by Bruce_in_Oz View Post
How fast do you want to go?
It would be above 2600 FPS Sierra has rated their matching BTHP at .462 @ 2600 fps and above. I'll be developing hunting rounds on Hornady 165gr GMX haven't set in on a powder yet, but might just load RL-17 since a have a pound of it already and try the IMR4064 to see what works best.