If I'm shooting on public lands, I always consider there may be people around, not there there usually is.... but the safety rules always apply; consider the backdrop one, in front of the target, not shooting up, over a rise or hill etc.... So considering the size of the area;
http://delwp.vic.gov.au/__data/assets/p ... iewMap.pdfWhich are up to 7 or more kays long.....there not small fenced of areas, maybe thats what some people are imagining??
Although there may be public safety zones in place as well, these are not mapped on the game or other maps and are areas normally associated with forestry from where you can be 'removed' and as far as I'm aware can not shoot or hunt. They cover vast areas....
If unsure ask the alphabet department, but they will almost always take the 'safe' approach and say 'no', whether correct legally or not.