Back in the 70s Winchester set up some kind of trolley upon which 1,700 game farm ducks were strapped. When each duck passed a certain point a shotgun in a machine rest was automatically triggered, centering the duck in its pattern. Survivors went into a pen to see if they died or recovered. I am told that remnants of the duck trolley still exist at Nilo Farms, although I haven’t seen them. There is little chance, I would guess, in these times, that Winchester would ever set the thing up again and shoot more ducks.