Thoughts on s&w 40?
Not true. ^^^^^ that last sentence.
It was made because of the use of hardball ammo failure in 9mm.
FBI wanted something better. So they went with 10mm. Agents couldn't handle it so they mad the casing shorter. ie: .40 s&w. it was marketed to LE all over the nation. Right place at the right time.
Now with hollow point technology the playing grounds in handgun calibers are almost evenly matched they're so marginal in difference.