The bullet we use in our T/C Pro Hunter is the 250 grain T/C Shockwave with three 777 pellets. If I had to choose from the three choices you posted, I'd go with the 300 grain SST. Although, depending on your powder charge, you might want to choose the 240 grain XTP.
I guess the best answer is to try out all three and see what shoots best out of your gun.