.40 S&W has no more ability to penetrate a sloped and curved surface (ie a windshield) than a 9mm. Additonally, windshields, especially on heavier vehicles like ambulances, are fairly tough critters.
Fhqwhgads does bring up one more strike against most .40 S&W. The VAST majority of them are just built-up 9mm standards. Very few manufacturers are bulding .40's from the ground up. H&K did it that way with their USP series, but the majority are still 9mm's that have been beefed up. I don't care for that concept, especially on something as notoriously weak as a Beretta.
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