41.5 H4350 with the 143 ELD-X has given the best accuracy in mine. I've also been shooting the 139 Scenar and 142 Accubond LR with H4350, RE16 and RE26. The RE powders give slightly less accuracy and a bit more velocity. 42.5 RE16 with the 139 Scenar is what I loaded to hunt with this year.