I shot my first turkey with a bow this spring. I used a spitfire 100 grain which has a 1 1/2" cut. My bird was quartering away. I hit him just behind the wing and the arrow came out 1" to the right of the base of his beard. It was a complete passthrough. He walked about 15 yards and died.

I'd recommend a big mechanical head and aim for the center of the body.