In our younger days we shot hundreds of Goats down Awakino and found them ok so long as you were close no more than 50 odd yards and hit them in the head or neck. Body shots like lungs and heart tended to have them run a bit and it paid to get a few more rounds into them.
If you can afford a centerfire like a 222, 223 or similar you will be good to go. If the 22 is the only option go for it but pick your shots don't stretch your barrel that's when you will end up with wounded animals. Power Point is good ammo for the job.
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