OK, as Russ was prone to say, "I could be mistaken" or in my own vernacular, "I could be wrong."
I'm aware of a too quickly & closely shot pheasant two years ago that was simply eviscerated as Dave describes & I've also seen dove disappeared mid air w/no more then the wings wafting down toward the ground afterwards. No prolly about those shots; it was more than the wad that hit them.
That's why I like tight chokes in my 12 bore game guns- "You've about had all the thrills in wingshooting when you see your quarry, well centered, crumple in the air and drop earthward" T. N. Buckingham "The Dove"--