Didn't play with it much, but I used IMR7828 with 95gr BTs and Rem 9 1/2s.
Hit 48g without pressure signs and ~3050 fps.
Then got the chance at a threaded barrel and swapped barrels. Have not tried the new one yet, so I am also interested in 243 loads with 95gr BTs
AA 4350, RL22 and 7828 will be tried on the new one.