I've had my 63 for four years and it's a good gun, but it does get finicky. That's characteristic of any rimfire revolver, in my experience.
My 63 was a replacement for my beloved old blue 34 four-inch, which I sold during a divorce in '79, to my considerable disappointment.
The 34 wasn't quite as touchy about cleanliness and gave less trouble.
One can't help but wonder that the 63 was discontinued, like the 940, another J-frame with a spotty record.
Among my other .22 revolvers, my Colt Trooper is my favorite but still wants the fresh cartridges thumbed into place solidly after about fifty rounds, and my stupid old Taurus 94 nine-shot, practically a throwaway gun, is less trouble than the better Smith and Colt.