Very funny. Used to see lots of ruined cars near the Stuart Highway especially when the SA section was dirt and rough, and the NT section was a 1 1/2 lane highway with no fences and lots of big "road trains" (3 trailer - trucks).

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RLI is right, if the movie was historically correct the lever action would have been a .44/40 or a .32/20. Maybe some .25/20s too. Maybe the movie makers used a .22 rimfire

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Australia today doesn't really have a firearms manufacturer unless it is some small custom shops.

Steyr-Aug Austrian assault rifles, were made or assembled in Australia for the Aust defence forces, NZ, Pacific etc.

Lithgow used to make .303 Lee Enfields for the same plus some single shot and magazine .22s and shotuns.

The original Warne Brothers "Kimber of Oregon" started in South Australia. There is a SA town called Kimber.

Probably others I can't think of immediately. But with a population of only 20 million and no government support except for military requirements it is cheaper to import.