Which calibres can I use?

Medium – large game on open terrain requiring longer range shots: 

Kudu, Zebra, Gemsbok, Waterbuck and other animals of the same size.
.338 Win. Magnum, 7mm Remmington, 30-06, 7X64
 
Medium – large game in bushveld requiring shots over shorter distances:
Eland, Kudu, Blue wildebeest, and other animals of the same size. .
375, 9.3X62, 30-06(heavy grain), .308, 7X57, 303
 
Rifle hire is available for $40 per day per rifle