I haven't done much with 125 grain bullets, but with the other two I know a wide variety of powders will work nicely.
IMR 3031, 4895, 4064, H4895, RL15, N140 ... mid range stuff. Very similar to the 308, as you suspected. But since you're loading for a '99 you might want to stay away from powders that need full 308 type pressure to do well.
