I've only used H322 under 40 grainers in my 223 bolters, with excellent results. The nice part is it all burns and is quieter than slower powders, I've been thinking about trying it to make a gas gun load with it, see if the pressure curve makes the gas system run better.
H 322 should be fine in 223, so work up your best (and probably stiff) load with that, then work up another with TAC. TAC seems to really like being under 50 through 60 grains.
