RE: I have a stupid question about shot size
Mez is correct.
The wing butts on turkeys are like riot shields..... and they will stop pellets with shocking effeciency.
When a bird is in flight, he is showing you his underside.... which allows you to slide one into the vitals under the wing... where the breast is thin, and there are very few feathers. But even at that... it is a low percentage shot at best.... and often its nothing but luck found shooting too far behind.
When I'm waterfowl hunting.... I shoot them in the head.... or at least I try too. I don't like chomping down on metal at meal time. The head shot on a turkey is really the highest percentage shot, the most ethical shot, and certainly among the more lethal of shots to take.