After trying many different powders in my 270s with 130gr bullets, H4350 is my favorite in terms of velocity and accuracy (53-55gr). IMR-4064 is my second favorite, because it shoots well and is the cheapest due to the charge weights (49-51gr). I also like the “snap” of the 4064.
Like others have said, you need a lot (full case) of H4831SC to get decent velocities. I saw no better accuracy, and was burning 10gr more to get similar velocities. It’s also more of a push with respect to recoil.
RL26 will give crazy high velocities with 130s (>3250 fps), with a full case. However, I don’t like to push cup and core bullets that fast, and at a reduced load it’s a bit sooty/dirty. However RL26 is “the” powder for 150gr in the 270 Win.
