Re: help working up a 300 rum load
You are on the right track.
If it was me personally, I'd load only 3 at each weight of 90,91,92,93,94 with the bullets seated to just touch the lands to start off with, and of course watching for pressure signs.
Whichever weight shoots the best, you can start to tweak the seating depth.
Good luck and let us know how it works out.