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Cory, I can think of another couple of examples.
I believe that one of Scott Reitz’s shootings involved using a shotgun against a suspect seated at a table during the execution of a search warrant. The suspect reached for a gun on the table and Scott shot him, almost amputating the arm reaching for the gun. The suspect then began reaching for the gun with his remaining arm and had to be shot again. This one was detailed in his The Art of Modern Gunfighting book but it’s been a little bit since I’ve read it so I might not have the details 100% correct. I also remember reading about a NYPD Stakeout Squad shooting in which a suspect needed multiple rounds in the torso from a shotgun before he ceased hostilities.
No single gunshot is a guarantee of stopping a threat, some are just more likely to than others. I can understand why some members want a side saddle and a butt cuff on their gun. I personally think a second on-board source of ammunition is past the point of diminishing returns when looking at value gained for additional weight but other’s mileage may vary.