I don't know what you have available in Australia but if you can get your hands on some Red dot It works well in vintage 10ga's. I use once fired Remington hulls and a Remmington wad along with 19grs red dot a win 209 primer and 1 1/8oz shot. Mild but effective and it works just fine in all six of my vintage 10s. Only wish it would work in my 8ga's.