.375 Ruger in Aust, IMO not a chance in hell. .416 Rem Mag, a small chance in hell.

And if Darwin also as hot as hell ... I had trouble buying some extra .375 H&H Mag ie none and even extra .308 Win loaded ammo in Darwin and Katherine once upon a time.

Other Aussies can correct me if their experiences are different. Sydney is a long way away from Arnhemland as well.