A local sheriffs deputy responded to a belligerent customer call at a bar. The deputy feared for his life, pulled his 9mm and immediately sprayed an entire magazine into the bar as he came in the door. Innocent customers, the bartender, a waitress and a cop outside the bar were hit, the belligerent customer came through unscathed.

The 9mm round that hit the cop outside passed through the 1" knotty pine indoor wall and a 1/2" outer wall. At least in that instance a 9mm round showed the penetration capabilities.

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U.S. Coast Guard, retired CPO