The 69 Sierra and 68 gr Hornady work well, as does the Hornady 75 Hollow point match (but not the Amax.) AMax is too long.
Varget, 748, RL15 and 4895 are all good powders.
The 69g SMK and Varget work great in mine as well out to 500 yards. I have also tried 55g V-max and Varget for gophers that works great as well, at 100 yards the 55 V-max seems to group every bit as good as the 69 SMK but have not went any further with the V-max. I have some 52g A-max I am going to play with soon as well. Has anyone tried the 40g V-max in the 1:9 twist?