One lesson to take away from this IMHO is that you CAN miss with a shotgun, especially at close range.
Today, WSP had scattergun familiarization drills at our range. 20, 870 shooting Federal LE 00 buck with flight control wads. Average group size at 15 yards was 3 to 4.5 inches. YES you can easily miss with a fighting scattergun at close range, regardless of the myths and Internet legends.
Good Luck & Be Safe
First, with the most, WINS!
Regards, Scattergun Bob