Never loade the TSX bullet but i have been usin 64 and 1/2 grains of IMR 4350 under a 140gr sierra gameking for years and its a very accurate and killing load for me.Get about 3150fps through my chrono and 3 shot groups touching at 100 yards.Killed alot of deer and hogs with it and it drops em in their tracks.Also experimented with some IMR 4895 that my buddy gave me and it shoots exactly the same with 56 grains same bullet impact and velocity as my pet load.