Cleaning the action - After every range trip that isn't immediately followed by a range trip. (meaning that if I'm shooting today and plan to shoot tomorrow, I'm not cleaning tonight unless I had an issue) Cleaning the action implies that I will at least run an oily patch or two through the barrel to remove chunkies from the bore and chamber.
Cleaning the barrel - Done every 3-4 range trips, probably a bit over 1000 rounds. By "cleaning the barrel" I mean solvent applied liberally, allowed to soak in, plastic brush applied, then patches on a jag until they come out clean, then oiled patch / dry patch a few times.
Scrubbing the barrel - Only when "cleaning the barrel" won't yield clean patches in a reasonable amount of time will I run a metallic brush through. Metallic brushes include bore snakes with built-in metallic brushes, by the way.