Yes I have used the AAA cartridge in 12 gauge. They are extremely effective on foxes and smaller pigs. For bigger pigs I prefer 00/SG buckshot. Winchester used to make shotgun cartridges and 22 rimfire cartridges in Australia but I am unsure if they still do. Winchester Australia has stopped importing their reloading powders into Australia along with my two favorites cfe223 and superformance.
I have included a photo of my favorite close range pig load for you
