I had never seen a 3" 66, or Model 19 for that matter, although the book on S&Ws I have lists both as having been produced in limited quantities. Of course 3" Model 13s and 65s are quite common but I had never seen a 3" 66. I've always thought the combination of 3" barrel, with the corresponding full length ejector rod, and a round butt grip configuration was about the best choice for a concealed carry revolver. The barrel is long enough to actually get some magnum performance out of all the blast and recoil, yet this is so much more controllable than the J-frame 357s that a comparison isn't really fair. Although I am essentially a 1911 person, I now have a revolver that is suited to my idea of a concealed carry wheel gun. Smiley face goes here!!!