I've tried most everything from H4227 to IMR4320 in the .223. (not to mention 700X, Bullseye, RedDot, BlueDot, Unique, ect with cast bullets....)
I prefer the BLC2 @ 26.9gr and 55gr bullet. I've also loaded up as heavy as 77-80gr with it. Still superior performance to "the mighty Varget".
The lot#'s of Varget I've tried, I couldn't get enough in the cases to approach the advertised velocities. BLC2 is tops, and only thing else really close is Reloader 15.
I've tried three lot#'s of H335, two of TAC, and currently playing with some BenchMark. Still can't beat any of the several dozen pounds of BLC2 I shot through the years. Heavier charge loads than H335, but more velocity and equal or better accuracy. Especially with bullets heavier than 55gr. (ie: 63 and 65gr Sierra's).