I'd try a slower powder like Ramshot Hunter, Re-19, IMR 4831, or H4350. I've had excellent results with all of the above, even with sensitive bullets like the old Barnes X, the Swift-A-Frames and the Hornady Interbonds.
What I've found if you want to seat the TSX close to the lands is that you need to start at least 10% below the listed maximum charges. At .050 off the lands, loading data for such bullets is tha same as it is for cup and core bullets. E
