Began loading for the 284 around 30 yrs ago. Win 760 or IMR 4350 was the best back then. 760 was temp sensitive. IMR 4350 didn't fit that well. Then came H4350 which solved those two issues, it has finer grained powder and is pretty consistent over a wide range of temps. Used it for many years until RL-17 showed. Now using RL-17 exclusively.
