If this is like a normal pigeon shoot, these are wild pigeons trapped off of some building roof or barn and they are turned loose to be exterminated like the winged rats they are.
As kids we used to hit up all the local farmers to do some shooting. Most let us with the stern comment: Don’t shoot the buildings.
We would head to the silo, find some rocks and draw straws on who threw it. Once the rock hit the silo it was on. We’d give them about 25 foot
Clearance then fire away. We had pump shotguns back then. They usually would go from silo to barn. Rock to side of barn and game on again. We went thru boxes of shotgun shells by the dozens. (Usually paid for with cash earned by putting up hay in the farmer’s barn)
I think about that every time I am in the City and see all the pigeons. Shittin, stinking things!