My opinion is that if there is someone so foolish to shoot at a single feather, or even an Indian war bonnet full of feathers (no disrespect to our native americans) he should not have a firearm in his hands in the first place. We need to police our own.
In Mississippi, a legal gobbler has a 6 inch beard. That illiminates the "Bang Bang into the brush" mentality. I think that is good guidline and promotes clear shots.
On a humorous note: My dear father who was a champion for hunter safety and ethics, was hunting a gobbler that was responding aggressively to his calls. the terrain was hills and hollows and when your shot appeared, you had to take it. Well the repeated gobbling got closer and closer until a turkey head (no more that 20 feet away) broke the horizon of the ridge obstructing his view. One shot from that Ithica 20 ga. over/under and the woods fell silent. He had killed a mature hen and the gobbler disappeared into the spring undergrowth without a sound.
He walked back to camp toting an old hen and a heavy heart. When questioned about the hen he responded, " damn lesbian". We all got a good laugh and had quite a feast that evening.
The point of this story is to say that in 1986, There were very few turkey hunters and a shot like that was understandable. But today, we have many more turkeys... and hunters. Today my dear old dad would be chastized for lack of judgement. Ethics are changing for the better and I feel the wildlife will benifit.