I remember reading somewhere about a shot from a 1 1/2" bored punt gun, that spewed 3 pounds of #3 shot, killing 127 ducks with that one shot.
IIRC, the article noted that the closest ducks were 90yards and the furthest were 'about' 120yards.
That was supposed to be a single shot record.
I don't remember where it was supposedly done nor by whom.
3 pounds seems like an excessive shot charge, to me, kinda like 1 1/2 to 2 ounces in a 20 bore.