I am heavily vested in IMR powders, evidently I need to get some XBR 8028. It seems that H335 is the most popular powder used in this thread.
I've only recently become acquainted with the .223 rem, but have been loading for my .222 rem mag imp for some time. Normally I shoot the contender but peer pressure has gotten me in ARs.
I shall tread lightly into that good night.