it would be a cheap (ammo) practice gun for your normal J frame
Yep -- that's the best use for that li'l thang. Drills. Pocket draw/get off the X, two to three shots. Reholster. Pocket draw/get off the X, two to three shots. Reholster. Etc.
Also I guess if you had to do a lot of finishing shots on a farm or something, and needed a super light gun for it.