Tex-Check out Art's website. Then perhaps call them. They should be able to do what you want.
http://artsgunshop.com/site_map_Gunroom_Gunsmithing.htm Kirk Merrington might be worth a call as well.
Nick Mackinson in Ontario.
It's not a huge task to bend the barrels, but you of course risk rib springing, denting, and need for refinishing. It would need to be done iteratively to get the POI you desire.
Any calculated numerical change might not give you what you want on the first bending. You are looking for pattern with a certain load it would seem.
