Pretty simple....
IMR 4895, IMR 4064, RL 15 and if able to make it 4 favorite powders, add IMR 3031...
I think he wants 3 of your favorite powders for each cartridge. I'd vote for keeping it simple and finding one or 2 good powders that will work for all of them, or maybe 3 at most.
For example: H4350, Big game and RL15. A guy could do an awful lot with those powders. H4895, IMR4064 and AR Comp would also be great powders to look at.