Tac works just fine in 308 with 168 or 175 bullets. Their load data is posted online for free, very helpful. They even have the balls to post 5.56 data.
Tac does swing with temp more than varget, but it will shoot fine. It seems to clean up and get more consistent near the top of the load data fwiw, but i do not load MAX with it like i might with varget because of the extra temp variable.
No issues with 5.56 or 308 gassers eating Tac here, but I do have adjustable gas on them.
Varget is my go to for 223 and 308 bolt and gasser, 69smk and 175 respectively. Well, we all know how fun varget is to find, so i worked a new load up using tac since I scored some local. Feeds through a powder measure! Been shooting it out to 600 yards, no complaints. Prefer varget, but tac will work fine.
For me tac really shines in carbine loads and practical style shooting inside 500 yards, not shooting tiny groups from benchrest rigs. Its consistent enough and priced right AND AVAILABLE lol. Fast loading with thrown charges is pretty amazing when youre used to varget lol, so yeah, will be burning plenty of tac with no issues here.
Yes yes of course there are other powders that work and meter... but i got a hell of a deal on a shit ton of tac when nothing else was in play AND the OP asked about TAC, so im thinking a similar situation there lol.