Not Sure what's available in SA but here is what has worked for me in the 2 10 twist 243s I've owned.
95 nosler BT, The BC isn't terrible and they kill very well and are accurate.
90 Lapua scenar, probably the best you can do for high BC in a 10 twist. They are a little soft for me on game.
87 hornady VMax, good bc, accurate and explosive.
I tried 105 Hornadys in both of mine. One wouldn't stabilize them, the other did but shot them poorly
