Lefty,
The 'Hunting Reports - Africa' and 'African Big Game Hunting' forums over at AR are the best for up to date info and experiences. Browse through the subjects - this one comes up often, particularly with the almost daily changes in rule interpretation in RSA.

The transfer at Joburg is the most likely to create hassles, if you have to claim your baggage in transit - see this AR thread.

For an overview of the rules, see this AR rundown , and the PHASA site under 'General Hunting Info'. Note particularly the section on required paperwork, if your baggage isn't transferred by the airlines.