LB - I think the Parker system of numbering frame sizes without associating them with a particular gauge is really the best system. That way I don't have to wonder if the #1 frame 16 is on a scale 16 frame or really on a 12 frame. It is simply a 16 on a #1 frame and I can get a heavier 16 on #1 1/2 frame or a lighter one on an #0 frame. You can only go so small in frame size for any given gauge, but you can always go larger as per Researcher's 20 gauge on a #2 frame.