Your .243 would be ideal @Phil_H not only for the 300m+ shooting needed for roos but also for the bigger beasts you are likely to run into as well. Plenty of pigs and fallow about in SI roo country (I've also run into reds and chamois too).
I once used a 22mag on the hoppers but only for spotlighting at short range from the back of a ute. Moving ones got a whacked with the 12ga and those that were still got a bullet from the magnum. That was the rules of the farmer we were out with. Also whose rifle we were using so not sure what ammo type, but at distances out to about 60-70m they went down with a chest shot.
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