What I mean about effective burst, is the camera would move as fast as if you were intentionally shivering your head.
But not as big of a radius as shown here. It kind of hurt my eyes trying to look at the screen. and if possible, try having each camera sway increasingly becoming still, so you will know what bullet, or explosion made the camera shake.
And how long the shake should last between shakes, I'd prefer a low number, like 0.1f or less.
Please be aware that I've never tried to shake the camera in any way yet.