I am having a hunting partner of mine (who is also a gunsmith and a state long range champ) load up another batch for me. I had a lot of problems finding the sweet load for my Winchester Super Grade .338. He glass bedded it for me and worked up some loads and turned it into a MOA shooter with the 185 gr. TSX. He was unable to locate any available TTSX during the last couple months, so we stuck with the TSX. I will check with him on the powder that he used, and get back to you. He cronographed the load at 3034 fps. I have shot two 6x6 bulls with it, and both were DRT. The first was a high shoulder (running shot) with a recovered bullet under the far side hide. The second went through both shoulder blades and again was found intact and well mushroomed under the hide. Both had been stalked from miles away, and were shot at under 60 yards. The TTSX will have a better BC, but at the range I am apt to shoot it will make no difference. I probably went through $200 of factory ammo (mostly 225 gr.) before going this route. My only other bull was shot with factory 225 gr. Accubonds (40 yards). He did spend some time working up an optimum COL.