Yes. A pistol round sucks compared to a rifle round.
I'm not telling you the 9 is as effective as the 40. The FBI is. And science. Energy = mass x velocity squared. 9mm has higher velocity so they quality 9mm defense rounds produce about the same kinetic energy of a .40 round. You must also factor in capacity and recoil for follow up shots.
The reason you probably don't know a police officer in your area that uses the 9mm is likely because their departments are behind in upgrading their service pistol to 9mm like most other departments.
If you scroll up slightly, you will see I just ordered a PCC yesterday so I'll be shooting 9mm for the foreseeable future.
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