Still O.K. to hunt ducks and geese; in fact anything, with an 8 here in the U.K. . Just have to use non-lead shot in England and Wales for waterfowl but lead still O.K. for anything in Scotland if not over wetlands.
What powders do you have available to you? I have information for American Alliant/Hercules Blue Dot, French Vectan AO and British Nobel 82. Don't know what components are available to you in Australia. I will help if I can. Did you chase up that lead to the 8 bore loading book I sent you? Lagopus.....