This is a great topic, thanks everyone for the discussion.
I ALWAYS pick them up whenI am target shooting. In fact, when we go target shooting, we take plastic bags and pick up trash for 15 minutes PRIOR to our shooting. Then we always pick up our own when we are finished. It is amazing what a difference that can make. I am trying to teach my kids to be part of the solution rather than being part of the problem. They didn't understand at first, but now they do. I'll never forget one trip out, I asked my son if we were forgetting anything. He said, "Oh, I'll go get some bags!"
Now, I will admit, I am not so good when hunting. If I am in a duck blind, I pick up as much trash as I can. But out upland hunting, I am just not in the habit. Usually after someone shoots we are so focused on making sure the dog is on the bird and readyif another bird flushes that it just doesn't get picked up.
Again, thanks to all you, I will put much more of an effort intoretrieving the empty hulls. I do pick up any litter along the way that I see including other empty hulls.