I think that I would be fairly close in saying that 70% or so of roo shooters would use 223s with the rest being 222s or maybe the odd 243. Longer range rabbit shooters would usualy use 22/250s or 220 swifts while 223s and 222s again would bag a fair few. I think that the few different than in U.S is that the 308 is very popular in Australia and the 30/06 not quiet so popular. Then you get the occaisional wackos like myself who prefer the oddball wildcats and such.