When I bought my rifle a few years ago I bought a box of each type Weatherby made and tried them all. It favored the 115gr Barnes X bullet. I bought a goodly supply and haven't had to buy any more since.
I see that they have discontinued that round but I suspect that the 110gr TSX would do well too. At the Barnes reloading site they tell you to set your bullets .050" off the lands as your starting length, instead on near or into the lands as most advocate. This seems to go hand-in-hand with the Weatherby design of "excessive" freebore to keep chamber pressures down. That would be my first load to try, followed by the Accubond. But you really need to try a few before making an investment in a large stock of something that doesn't work well in your rifle.
Best of luck with you new toy.