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Depends on the era you have in mind. Sporting or military?
I would say British military service ammo. 303British or 577-450. The sun never sets on the Empire.
Without knowing which part of the tropics you are talking about anything from a 22rimfire to a 458 LOTTE could be applicable and don't forget a shotgun.
Not nearly enough information for the answer you want. Some nations require a minimum of .375 H&H for big game.
WW2 German 8mm came in a dedicated Tropical load, but that was the last ones I can recall easily. Most modern stuff is good to go. Federal Premium with a nickle plated case and waterproofing would seem a good choice.