Go to hodgdon.com and click your way in to their 350 RM section, and you'll find it likes pretty much any of the fast'ish (3031) to medium-fast (4895/4064/H335/BL-C2/etc..) powders. 2015BR and W748 work pretty well, too.
In my (you know the drill, start low, work up, etc..) 700 Classic, I've...