I have known three shooters who have learned to shoot left handed. Two due to the loss of an eye and the other due to cross eye dominance. One of the shooters who lost an eye was arguably the best trap shot of his time.

As an aside years ago we were in Bath England at a gun shop where they were working on a crossover stock on a Boss o/u. I was so taken with the stock that I failed to look closely at the gun.

jlb