have you tried h4831 i get 3106 fts with the 180gr accubond using 79 gr and federal 215 gm primers fed brass don't remeber oal off the top of my head this is with a 26 in hart barrel i've shot some 3 shot groups under 2 1/2 in at 500yds definitly start out lower and work up this is max in my rifle
My load is 76.0 grains of RL22 under the 180 grain Accubond...sub m.o.a. all of the time, with some mighty small groups on a regular basis. It is a max load in my rifle and averages 3,182 fps out of my 26" tube.
I tried a lot of different combinations in this rifle...none of which were "bad", but the above mentioned load made this gun a real shooter.