If I were going to hunt in the CAR or similar 'jungles' then I think that I would go with a synthetic or laminated stock, controlled round feed stainless action, 20in barrel, black teflon or powdercoat type finish. It would probably be in .458 Winchester, as the cartridge is widely available in that part of the world and uses a standard length action, but maybe a reduced velocity Lott with a heavier bullet (as it can also fire the Win round).

If I wasn't afraid of rust or split walnut stocks, I'd probably use a double otherwise