I use Reloader 15 for .556, 55 grain, .308, 130 or 150 grain and 30-06 150 grain.
I can get varget to work the .556 as well as RL 15, but the .308 doesn't like varget. The most accurate load my 06 ever found throws 150 Barnes ttsx boat tails out at 2950 with RL15. That load is good for anything I hunt.
If only my .338 liked that powder I wouldn't need another rifle powder for what I'm reloading now.