Assuming Jim doesn't shoot parallel or reverse-combed guns, the cranking down (bend) of the stock insures that his 90 degrees to the comb cut achieves pretty much the same result as the angular mensurator types. Different animal from normal to the sighting plane or rib. Don't need more confusion.
Big fast loads from the top barrel of an o/u always sting me. I have no theories about the effects or efficiacy of correct/incorrect pitch except that the butt will sheer on the flesh with either too much toe or too much heel. I haven't made a study of which hits you harder under the cheekbone but I would guess too much heel is the worst for this.
jack
