I believe my father dropped his Oryx, Gemsbuck, and Kudu with a .300 Weatherby. I can't recall the bullet he used in the hand load, though.
His were in Africa (along with 4-5 other "trophies" and a few pests).
I understand the appeal to "hunt" these animals in the U.S., but you won't find me doing it. It's more a point-and-shoot scenario, than an actual hunt.
If I wanted a canned hunt, it would be pretty easy to "hunt a dingo" and just shoot my Australian Cattle Dog while he was sleeping.