S&W is supposedly dropping the .357 Sig from the M&P line, most likely due to cost-cutting measures. Since Taurus and Charter aren't the most sought after names in the revolver business, they probably want to concentrate on revolvers chambered in cartridges that will sell as many guns for them as possible. The .327 is too new to have much of a self defense following. I have yet to hear of a story where it was used in a self-defense situation, and I don't plan on holding my breath until I do. Most pistol calibers that you have heard about have a police history of some sort, be it 9mm, .38 Special, .357 Magnum, .357 Sig, .40 S&W, .45 GAP, or .45 ACP. The .327 is probably never going to be used by any police department in the United States.