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where as teh 135 .40 and the 125 .357 magnum both dump lots of energy and break up when hitting auto glass.
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Talking about how the .40 performs with bullet weights under 155grs is like talking about how a football team performs with its backup quarterback (Jets and Steelers wins today notwithstanding
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When loaded with 180gr HST ammo, the .40 can penetrate a windshield, expand to 0.75 inches while penetrating 14 inches of ballistic gel with 92% weight retention on the bullet.
http://ammo.ar15.com/project/Self_De...BW_5_27_09.pdf
When compared to 180 gr HST ammo, the .357 sig still has a small penetration advantage but the .40 has an expansion advantage.
The .357s sig maintains its advantage of a flatter trajectory; but really if we are talking about cops engaging bad guys at 100 yards they will probably get the AR-15 out of the squad car.