Best .22 double action revolver? it is the HI Standard double nine.
9 shots, single or double action. shoots great, looks great, feels great. I have a bunch of them, all fine guns - never had a problem with any of them. shot thousands and thousands and thousands of rounds.
Accurate, great for trick shooting, easy to load and unload with swing out cylinder.
The model which is convertible (.22 long rifle or .22 mag cylinders) is a bit heavier than the standard model. I prefre the weight and feel of the regular .22.
cost? about $100.