I used IMR4350 with a Sierra 130gr. SPBT with my 270.
A friend has been loading his daughter's 270 Win with the same bullet but using H4831 and reaching 3175fps, nearly 200 fps faster than I was achieving with IMR4350.
My loads shot so well in my rifle that I did not worry about increased velocity. I went with the best accuracy load for my rifle and I recommend that you do the same for your rifle.
H4831 and RL-22 will work best with near max powder charges.
