You need a medium -fast for the 7-08, 30-06, and .223. Varget, 4895, 8208. There are millions.
You need a medium slow for the .300 and 7 mag. H4831, RL22, RL17
You could add a medium like H4350 or H414 or RL 17 that will work in the 7-08, .30 06, with heavier bullets and the magnum with lighter bullets.
It is good to simplify, and keep as few bullets and powders as possible. You spend less time and money chasing your tail and don't end up with a half pound of powder x and half a box of bullet y. Unless that is what you want to do.