IMO the most important thing would be to use a rifle that you are very familiar with, fits well, is reliable and of the appropriate caliber (for me that would be 375+). If ti were me and it was going to be a 1 gun trip, I would bring a 375/416 bolt gun of some ilk or a scoped (QD) Double in the same range of bullet diameter. If more then one gun, a 375/416 bolt and a large bore DR.