I have some .223s loaded up with 55-gr TTSXs, but for serious hunting or defense, I load the 60-gr Nosler Partition. It's scary accurate out of both of my ARs - one-hole groups at 25 yds. I shoot 12-ga hulls off of target stands at 100 yds with them. (Too bad they're $$$!)
I did originally consider the 60gr Nosler Partition's. It's now looking like that's the route I'm going, because most other places the TSX is back ordered. I found one company (Trajectory Technologies, Inc.) that has both 62 & 70gr TSX, but I'm kind of skeptical....don't know anything about the company? Also, Cheaper than Dirt has 62gr TSX as well.