I load Barnes bullets exclusively in my 7mm Weatherby Magnum. It won't shoot cup and core bullets accurately, for some reason, but really likes Barnes TSX bullets. Twist is 1 in 9" in a replacement barrel on a 1950 Weatherby rifle with FN Mauser action.
My favorite powder is RL-19. RL-22 is only a hair slower, a grain or two. I had high hopes for RL-25, but it wasn't as accurate as RL-19. I like 68 grains of RL-19 under a 160 grain TSX. I have shot 140s, 150s, 160s, and 175s. 160s shoot best. Bullet jump to the rifling is long, but it doesn't seem to matter. I tried longer bullet seating, and the rifle shot worse.
My recommendation is RL-22 and the Barnes 150s.
