The game kings should do the job fine, but you may find they begin pencilling a bit as the range increases. Wallabies are quite soft critters.
If you're likely to be spotlighting, or just walking around to find the wallabies, 223 will be perfect, but if you're planning to pick them off the opposite hillside, you may like to take the 7mm08. 223 is probably a good choice for unknown terrain and your first time after them.
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