Adam:
Feral pigs are shot commercially for human consumption in Australia, though almost all the meat is exported, mainly to Europe. They do however carry a number of very nasty parasites and diseases of humans, so without a proper meat inspection there is some risk involved in eating this animal, especially in the tropics.

There is certainly no closed season! They are a significant environmental pest and cause considerable damage to our primary industries. They are regularly shot to waste from helicopters at the tax-payers expense.

Buffalo are a bit safer to eat, so long as you know how to conduct a field-inspection for TB. If we do take buff meat, it spends a minimum of 2 weeks at -20 Celcius before preparing it for the table.

Most hunts in Australia's Top End are successful, I would say the one described is typical. I can't remember a hunt where I missed out, unless it was taking someone else out specifically to get them a shot. I may have posted this story before, but here's a fairly typical day-trip:
http://www.hotkey.net.au/~orrs/OctoberHunt.htm