Why? I used to own .40 S&W pistols, but I got rid of all of them. Even the FBI abandoned the .40 S&W. They went back to the 9mm. Don't believe all of the hype about the 9mm being anemic, when compared to the .40 S&W. The 9mm is not the 9mm of years past. There are loads that can give the same size wound canals as the .45 ACP. The 9mm round is less expensive. The S&W M&P 2.0 Compact pistols hold 15+1 in 9mm, and 13+1 in .40 S&W. The full sized M&Ps in 9mm hold 17+1, while the ..40 S&W hold 15+1. Two rounds don't seem like much, but then, 2 more rounds are 2 more rounds.
I carry in all of my 9mms, a defense round of 147gr JHP. These rounds are Federal 9MS. They come in 50 round boxes, and they are reasonably priced, government contract overrun. They have been both reliable and accurate.
The product info at my source reads. "This law-enforcement product is the next generation in high performance duty ammunition. This product offers consistent expansion and optimum penetration for terminal performance. A specially designed hollow-point tip won't plug while passing through a variety of barriers and this bullet holds its jacket in the toughest conditions."