I have used TAC in a 223 and it does very well. I am getting 3800 fps with a 40 grain Hornady V-Max bullet in a Shilen 26" heavy bull barrel. The accuracy is very good. I went on a PD shoot out in OK and used it as my long range gun. The conditions were very windy, so it was mostly luck past 300 yards. So yes, I have had some experience with TAC and liked it well enough, I bought an additional 8 pound keg.
I also have some Big Game I bought for a 7mm-08 I have, but really have not done much with load development yet. I also tried some IMR 4064. I have only done a little load development but out of the two types, I prefer the Big Game so far.
Good Luck and Good Shooting