I worked for the police department when we went from 357 Mag. revolvers to 9MM Sigs.
I wasn't impressed with the 9MM, and I wasn't the only one. I began practising double taps and got so I could do that real well.
They currently carry 45ACP Sig P220's. We used Winchester 124gr. Silvertips. I agree double taps with 9MM is a viable option for
serious use of the light round.