Odds are those Power-Shoks will be more than perfect, but just be careful of very close shots on the hard point of large shoulders on bigger animals. It's a soft, un-bonded bullet at almost 2700fps MV and could be a bit frangible in such an instance.

Is there any reason you have not considdered the Federal loaded with the 300gr Nosler Partition? It's just that I think it good insurance to up the ante' a bit in terms of bullet quality.

What area of SA are you going to be hunting?