FBI switching from 40cal. to 9mm https://www.americanrifleman.org/articles/2016/6/30/keefe-report-fbi-selects-new-service-pistol/
I get that there have been advancements in bullet technology, but I still keep my .40s near the bed and in the car when I'm not going to conceal carry. I do find that 9mm is much more manageable in something tiny like my Shield, which is why I have it in 9mm, but I'll take the bigger bullets when I don't need a tiny gun.
Wonder what will happen to all those millions of rounds that were bought on our dime?