Rather depends upon what bullet weight you're talking about and what you're going to do with it.
I've never used TAC, but I've discovered that I seem to need 3, possibly 2 powders in .223.
IMR 4198 was developed for this size case, it's wonderful with bullets to 60 odd grains. Economical too.
RE15 does the job with 75 grain bullets and provides superior accuracy, at least in my bolt gun.
69 gr Sierra Match Kings just love WW-748, but I've been trying to find time to at least try the RE15. I'm not sure why, 1/4 MOA groups make it hard to justify futzing with the load.