trooper, go over to accuratereloading.com and speak with the people there in either the Big Game or African forum,, several have numerous trips under their belt and a few are guides and outfitters/ PH's..
The 30-06 is well thought of, but if I understand the group over there your 7mm mag will work also and mite be the better round for the Wildabeast,, they don't call it the "poor man's buffaloe" for nothing..
Give Larry at Supieror Ammo a call and talk with him he can advise as well on ammo,,, For most all African game it seems they lean toward the heavier bullets in caliber
"I am always willing to learn,but not always willing to be taught"
Sir Winston Churchill