Big Duck Extreme, just like rifles, the manufactures tend to cater to the most popular market which is right handed shooters. I am left eye dominant and shoot left handed O/U' s and right handed autos set up for a leftie. Due to personal fit they all have adjustable butts and combs, ribs and are clay target guns.
The offset in which to describe is called " cast" . A stock made for a right handed person has " cast on" , or angled to the right. This enables the shooters eye(dominant right) to line up with the centerline of the rib, it also directs the recoil away from his face.
A stock inletted for a left handed shooter will have " cast off" , or angled to the left.
Ditto the above^ I have a Browning 1885 SS in 7mm STW which actually has cast off in the stock and it' s a pleasure to shoot.
Most field over and unders will have stocks that have " cast on" . There is a way that you could get to it to work and that would be to get a gun with an adjustable comb. This allows some adjustment to get your dominate eye over the centerline and change the point of impact.
You dont say what the shotgun will be used for but I assume ducks going by your handle. I dont know about Browning but Beretta does offer left handed wood on some models. Another alternetive would to have a good shotgun smith alter the inletting to change the cast. I am not a big fan of stock bending as they tend to creep back to their original position.
Hope this helps, AA