Once during a black bear attack on me, I used a Ithaca Model 37 DeerSlayer Pump shotgun with slugs and #00Buck mix to stop the bear. First shot 15 feet away - last shot 3 feet away, and I remember re-adjusting lantern in my left hand between 2nd and 3rd shot so I could see better, this was 11 o'clock at night in an unlit barn. My friend said it was the fastest 5 shots he ever heard.
The Ithaca allows trigger to be held back during pumping, firing as block goes into battery. This is on older models.
OldmanFCSA = "Oldman" at www.fcsa.org
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