In the case of the HW this would involve nearly running it dry I had 2 and if either so much as sniffed an oily rag the first few shots looked like they were old SAA colt's....
If power really is the be all for you then for I'd plump for CO2 power in the shape of the extremely customisable 22xx model, I've still got my custom one long after the HW's have gone.