the Keller&Simmann barrel insert shot the 9x17 Blank for the Blitz-Kerner cattle killer
https://en.wikipedia.org/wiki/Captive_bolt_pistol

https://www.333shop.com/de/shop/product/13-blitz-kerner-bolzenschussgerat-5148

the 9x17 blank is the old 380CF revolver case loaded in different hot loads from small animal up to bulls by RWS, Fiocchi maybe other

https://hausschlachtebedarf.de/rws-viehbetaeubungskartuschen-kaliber-9x17-50-stk

colour code show how hot its loaded. with different colours you get different firing range

the blitz/kerner is now maybe the most used of this devices and so also available in australia including the ammo. look for farmer or butcher shops.

anyway, the K&S barrel insert is expensive and to get it to australia may be a problem.
the american made DT system, dummy launcher looks not bad. its not a gun here and free to buy when 18 years old and that says lot. you find it on amazon for 134 euro, ammo cost 16 -22 euro for 100 22 lng rimfire blanks.half the price of the 9x17 R blank

https://www.amazon.de/Systems-super-pro-...pid=74318857649

https://www.hund-und-freizeit.com/hundet...BCABEgLNq_D_BwE

there is also a duck dummy from another firm that fits this launcher
https://www.amazon.de/-/en/Trainer-Dokkens-Launcher-Dummy-Winged/dp/B00E493EK6

you can use the dummy launcher without dummy also to fire the little 6 mm blank I recommend for a little starter pistol before so you dont need an extra starter pistol. when the dog knows it you can go to the 22 long blanks and fire dummys.
https://www.youtube.com/watch?v=0shVV7detoE&t=28s

I can't believe this is classified to be a "firearm" in australia.