I was about to say that the .17HMR (20gr load) is fine as I have used them heaps around Rotorua but I see you are from Dunedin. If you are shooting down there, you tend to shoot way longer distances and bigger animals. Even though wallabies don't have a big engine, no one likes seeing an animal limping off to find cover. Sounds like the perfect excuse to get a .204 or .223 ... keep safe in the hills.
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