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viper in a word, no. Sure you'll kill some, but you'll wish u had more range. If u can use centrefire you'll have more fun. A 223 is ideal and cheap as to run on budget ammo.

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 don't know the answer, but I do appreciate the suppressor on .17HMR, its a pretty bloody loud without it. Really need hearing protection if not suppressed.