H335 = WC844 military surplus (usually available) = 223 mil spec
can also be used to load 308, where it is best with lighter bullets.
BL-C2 = WC846 military surplus (usually available) = 308 mil spec
can also be used to load 223.
But what I purchased last was Accurate 2520 which will give you maximum velocity with 65, 69 and 75 gr 223 and 165, 168, 180 (all per Sierra manual and Accurates data). I have not loaded any of my one pound jar yet, but am already planning buying more. Accurate ball powders meter very well and I have really liked what I have used so far, which was 8 lbs of Data 2230-C.