Air Mauritius also flies from Perth to Africa via Mauritius.

Maybe a nice place to visit for a day or two.

Qantas flies Sydney to Jo'burg.

SAA flies Perth to Jo'burg.

In the past I have always flown either Qantas from Perth (when they used to do it, now it is just a re-badged SAA flight), or SAA from Perth, either to Harare (previously) or Jo'burg.

However SAA now has a policy of charging for every kilogram of excess luggage over 20 kg and if you carry a gun case with heavy rifles there will cost many hundreds of extra dollars.

So in future I will try Air Mauritius or fly to "backwards" to Sydney to catch the Qantas flight to Jo'burg.

Actually I would like to visit Mauritius anyway.

Regarding Asian countries I have been previously warned and heard horror stories and people travelling through SE Asia with guns, including Bangkok. I have also heard of people travelling through Singapore with no problems but presumably they were only in transit at the airport.

On balance I would avoid SE Asia when possible.