I shoot 73.5 gr RL-19 with 225 TSX - Getting 2906 fps average out of a 26" barrel.
My buddy shoots 68 gr IMR 4350 with the TTSX - Getting 2800 out of a 26" barrel
Both shoot under an inch all day long. Both use Fed 215 primers. I believe that mine are 70 thousandths off but can't remember the COAL off the top of my head.