I used to shoot the Trophy Bonded back when Federal offered them as a factory load for the 257 Wby Mag. I never had any problems with expansion, and it left golfball size exit wounds, but that was at ~3300fps. And as EastTxHunter pointed out, the video on Federal's website shows the TTBBC will expand slightly more than the TSX, yet still retains 90-95% of it's weight.
If I could find Trophy Bonded for my 257 Wby now, that is what I would be shooting!