I imagine as quite big animals... you would need a medium-heavvy caliber. I would go to choose anything over the 8 mm, or 9,3 mm
But sincerely... i have to confess that i never spoke to anybody who shooted one of them.... probably you will explain us much more ... and we will learn from your experience.
Maybe is a good moment to use one of these big calibers thst slept in the back of the armoury waiting your next trip to Africa.... and check the results on camel meat... at least a camel is part of Africa...isn´t it ????
Good luck..!!
Jose
-------------------- Spitskop Safaris - South Africa