When S&W first offered their J-frame revolver in 357 Magnum I wondered what on earth they were thinking. When they offered their Ultra-Lite J-frames in 357 Magnum I figured out they weren't thinking...they were marketing. They remembered what the original Dirty Harry movie did for 44 magnum sales. It doesn't need to be reasonable, or practical, or even effective. It just needs to sell.
YMMV,
Dave