322 is a little fast for the heavier bullets mostly used in HP (77, 80, 82) ... RL-15 and Varget are the most common choices, a couple of VV powders if you can find/afford them and AA2460 and 4895. 2460 meters very well, RL-15 probably next best, then Varget and finally 4895 which can be finicky to meter. 8208 is developing a following but it's new enough that there aren't as many well documented loads around.
Find much more info on the National Match forum (have to join to scan I believe)
http://www.usrifleteams.com/forums/index.php?act=idx
/Bryan