Here is the 80gr. Berger VLD seated over-mag-length at 2.390" using Wilson Arbor dies over 5.56mm pressure TAC in LAPUA casings@750yds. fired from an 18" SPR type accurized M16A2 off the tool box of my Tacoma 4WD. Sub-MOA at 750yds. from a 5.56MM auto-loader is a hard act to improve on but I am always willing to listen. But before you go there, TAC outshot all other powders I tested with in this Krieger/CLE barrel: H335, RL15, AA2520, Varget, VV N540, and a few other powders. Not surprisingly, the (3) most accurate factory 5.56MM pressure loadings I have tested with were ALL loaded with sperical powder: Black Hills 77gr SMK AMU load (MV 2746 FPS), LSA 77gr. SIERRA MATCHKING (MV 2760 FPS), & 77gr. Black Hills 77gr. SMK OTM based MK 262 MOD 1 SECONDS (MV 2825 FPS). If I can keep it simple (KISS) with sperical powder, handloading becomes much less of a chore. But bottom line is I will use whatever works in my rifles even if I have to trickle each charge.
Quick Note: In my experience, TAC is not a great .223 pressure powder: measured ES/SD are WAY too high at lower pressure levels. TAC starts to settle down as it nears the top end of .223 pressure and shoots quite nicely in the 5.56MM pressure range with the 77gr. & 80gr. TAC is also not a great powder for lighter bullets IMO. I used H335 with the 69gr. SMK for decades; it shoots. JMO.
Over-mag-length 80gr. Berger VLD over 5.56MM pressure TAC @750yds: MV 2822 & SD 6.24
Mag length 77gr. SMK over 5.56MM pressure TAC@750yds: SD 11.24