Gun fit using only stock dimentions is going down a rather slipery slope. I could build you two stocks with the same dimentions with one fitting perfectly showing a minimum amount of recoil and the other rather ill fitting and being painful to shoot. The width of the comb, grip, straight vs pistol, and location of the pistol grip making a very large difference. A thick comb like so many of todays target guns calls for more cast, especially for those of us whose eyes are closer together. Placement of the pistol grip translates into keeping the thumb away from the nose during recoil. Size of the grip is designed to fit the persons hand and provide a comfortable and repeatable grip.
The bottom line, gun fit is much more than a set of numbers from a session with a try gun. Unless you have a fair amount of experience I would highly recommend getting some help from someone who has done a great deal of fitting. It will be the best money you ever spent.
And I would suggest not betting against an AA class skeet shooter in the bird fields. While skeet is a very regimented game with known birds and angles, it is indeed a great way to improve ones field shooting. It will take an experienced skeet shooter much less time to be effective game hunting than the fellow who is limited to field hunting only with todays bird populations and regulations. Don Hansen.