I've killed 2 bulls with a .338WM (Win. M70, Leupold 1.5x5 VXIII, 250gr NP) the longest shot was 30 yards and the short shot was 25 feet, you could say I had enough gun. Neither bull dropped where shot, both went 20 to 30 yards. I hiked into the Diamond Peak Wilderness before sunrise, and apparently chose a good spot to wait. Shot both bulls within 200 yards of each other 5 years apart. This is not much help to your question, but a fun memory.