I used the 168r TTSXs out of a .300 Win Mag at 3200fps this ear in Namibia o everything from springbok to eland. they did seem to open up more than I have experienced with the 165TSXs (lower velocity) or .284 150gr TTSXs. This could be due to somewhat longer ranges or that I tried to shoot everything right on the point of the shoulder. On the larger animals there usually was no exit although penetration was certainly adequate.