The load I currently shoot (and which I like a lot) is 79.0 grains of Reloader 15, Federal 215 primer, Quality Cartridge brass and a 400 grain bullet. I’ve loaded Barnes TSX, Trophy Bonded Bearclaw, Swift A Frame and Cutting Edge solids. I get 2,400+ (2,400-2,410) in my rifle and all those group together, so hopefully you’d see similar results. With just TSX, I get groups at 0.80” with that load.
I also got a load directly from Jack Carter (founder of Trophy Bonded Bullets) back in 1988 that he really liked in his Hoffman. Jack suggested 81.0 grains of Reloader 15, Federal 215 primer and a 400 grain Bearclaw. That load gives me 2,510. I can still remember Jack telling me “It’s a hell of a good buffalo killing load.” He was right, it IS a great buffalo killing load. But so is my current load at 2,400 and it’s more pleasant to shoot.
I haven’t experimented with any other loads as both of those work very well.