Most of the time I've had better luck w/ IMR4831 w/ the 150's-160+ grain bullets, and RL22. IMR7828 for the 175 NPT which I know a lot of people may think it's outdated, same might say for the 150 BT, but they still just plain work.
RL26 is basically RL25 which is/was a very slow powder, I'd assume you'd want a fast twist with a heavy for caliber bullet.
Oh, I have used H4350 to fire form loads, it's better suited to the 140-150 grain bullets IMO, but I have tried it w/the 162 ELD-X. So-so for me, but my rifle is only a 1:10". I didn't see a real need to burn up bullets, or the powder down my barrel anymore, been there done that years ago with this gun, and why I went to test all the newer stuff was beyond me!