I've killed a few birds with a bow and I don't change my setup at all from deer to turkey. I'm drawing 70#, shooting uncut Easton fmjs, they are tipped with a rage 100g hypodermic, and most of the time my arrow stays in the bird. The only time I ever had a pass through was when I hit one low in the gut. I think it's the stiff wings and the bone that slow pentration.
Notice the arrow still in the bird. The only place (other than that gut shot) that I've shot them is where the wing meets the body, you hit them there with a good expandable broadhead and they ain't going anywhere. Both my birds last year dropped in their tracks. Now I had to run up and put my foot on their necks but they weren't going anywhere.