Oh boy, the world is your oyster. Get yourself to a range that has someone that can fit you for the stock dimensions you need. Everyone is different just like buying a pair of shoes. The stock dimension you are looking for is drop at heel, drop at comb, cast and LOP.

Once you have that you can start looking for a shotgun. Be aware that most people don't have a clue about that and wouldn't know how to measure stock dimensions. You need to avoid those individuals when purchasing a shogun. Buy one from someone who understands what you need.

Good luck.

__________________
That's just somebody talkin.