fullonshred

I would lean to the .40 no matter what "make" you purchase, for the "stopping power" reasons mentioned here. Better penetration with greater retained effectiveness thru automobile glass is another. The F.B.I had one or two big shootouts where the weaknesses of the 9mm. were glaringly exposed, with fatal results IIRC. The stopping power on a heavily clothed individual, i.e. heavy leather or winter jackets was insufficient, and there was a problem with 9mm hollowpoints clogging with the cloth/material because of the small hollowpoint opening and the subsequent failure of the round to expand. There was also a problem with stopping power after penetrating auto glass. After those problems in 1-2 major events involving the F.B.I. is when the big move to switch to .40 cals started in earnest for U.S.A. Law Enforcement.

10mm. looked for a bit to be the wave, but they were too recoil heavy and had large grips, and were also pretty heavy, all factors in making them much harder for smaller male and most female officers to handle and shoot well. They also wore out pretty quickly because the chamber pressures of the 10mm are pretty high leading to much earlier breakdowns than with 9mm and 40 cal. pistols. The 40. was an evolution that seemed to find a good balance between effectiveness, manageability, overall size/weight, durability, and magazine capacity.

Perhaps some more directly involved in law enforcement/gun collecting can touch up the rough edges of my post. I am working from memory of several articles that I read many years ago.

__________________
It's better to Shred, than to be Shred dead!