It is not legal in OZ to hunt with a pistol... but...
.45ACP and FMJ's are not good on roos, I hit one 4 times right in the boiler room with my grandpa's Springfield Armory 1911 and it just took off (I shit myself) and I had to go back to the car to get my .22-250 and put one in his head after he hopped a few hundred yards! Lucky it was on a big plain!