I'm one that's always used IMR4350, since I started loading. I wanted to make the switch to H4350, but it's been damn hard to find these days. Here's the list of my "go to powders":
IMR4350
H4350
RL15
H335
With this being said, if I still had my 270w, I'd likely be stuck on H4831 and RL26 as "go to" powders as well...