I did a data search a few years ago when working on .350 loads, and while there wasn't a lot of 180-grain data back then, what there was suggested IMR4895 would get the most zip.

There might be some info on newer powders out now, and more and more data is available on-line so its not as hard to find anymore. The big problem is the .350 isn't all that popular, so companies don't always test every new powder and bullet combo.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck