i really like the old surplus AA 2200 in mine , i havent tried the new stuff yet but it should be close , i also like their AA 1680 ( but i have a bit of the other ) i've been playing with cast in this lately but the speer 235 grain sp. does well in mine , h322 turned in my tightest group with that bullet , with what you listed i'd try around 35-36 grains seems that that was close to where your tightest accuracy was , a few tenths either way ... maybe seating depth or a different primer , just have to play to find it