Before you throw ammo in your traveling bag, check the South African laws. I'm on my way over there for Buffalo in Botswana and just filled out the SAPS 520 Form. It has a place on pg. 8 to list the ammo you're bringing in to SA. Now, I'm not a lawyer (thank the good Lord), but I'm fairly sure that you cannot bring ammo into SA that's for a different caliber rifle than the one on the form.

Best to check with those that know.