Peter
Do what you wish--but based on the animals you will be hunting and my experience hunting those exact animals in the past on more then one occassion--shooting the blesbok and especially the gemsbok..shots can and tend to be on the longer side for Africa..in addition. gemsbok tend to be unusually tough---shot my last one with a .300 Ultra-mag at a bit over 200 meters..using a 200 gr A-frame--he still ran for over 100 yards before he dropped in the bush..same for the black wdbeast...the ones I have shot were unusually spooky, amazingly tough and quite a bit bigger than any of the implala I have ever shot..and trust me--I have shot impala by the truck load...do what you wish--but if it were me I would take at least one firearm that is a big flatter shooting and scoped...either a 300 or 338 ...

Good luck on your hunt

Ripp