Birdwatcher: Waterfowl - always!
Upland Game Birds 90% of the time.
We have game wardens here in SW Montana that HAVE issued "littering citations" for waterfowlers I know who have left the spent shot shell hulls in the field.
I have come across piles of 3 1/2" shot shells lying in wheat fields that other "Hunters" discarded and I have even picked them up.
I imagine the farmers who own the fields don't really want the hulls lying around?
Hold into the wind
VarmintGuy