Old adage. "Use enough gun". I've been big game hunting since 1962. Started out with 30 cal and later followed Jack O'Connor to the 270. The 270 worked great most of the time. But in hunting you do not always get the perfect broadside standing shot at that once in a lifetime trophy. I wanted something that would work all the time, So I decided I wanted a minimum 30 cal shooting bullets fast. I wanted a bullet that would penetrate and keep on penetrating in case shot angle was less than perfect. I bought a German made 300 Weatherby Magnum shooting my reloads very fast. The rest is history: elk, bears, deer, gemsbok, kudu, wildebeest. Some might say overpowered but good to have the power when you need it. Think about it, you are half way around the world back in the boonies and trophy opportunity presents an angling shot you want enough gun. 30 cal magnum. The faster the better. Recently got a new Mark V Weatherby Accumark. Caliber ? You guessed it 300 Weatherby. When flying I put ammo in different bags incase some luggage gets lost. Check with your airline and arriving country for specific ammo requirements.