Nice, I've heard of the new/newer more temp stable powders, my old load with H-335 was built in 95 degree Oklahoma heat, should be GTG for any African hunting, the 450 gr TSX would indeed be a do all end all bullet for the old 458 WM, I love the round AND my old Browning Safari Grade rifle, it's light, accurate, and carries about like a bird gun.
That brings back the memories. I remember handling one of those Browning Mausers, new on the rack, back in day. It seemed a little too light and my wallet was light to match. I wish I had got that and still had it today.
;]
