I have killed almost all of my birds in the woods. One thing I like to do is get a barrier between myself and the bird at about 35 yards from me. A fallen tree, knoll, brush, or whatever is available works. I feel like if the bird thinks he should be able to see a hen and can't they will hang up. This way by the time they are in the line of sight it is too late, they are in range. Also, I don't use decoys at all.
Hope it helps