This is the story behind my shooting bullseye (BE) competition left handed...
BE is a one-hand only shooting competition.
I had shot 2 matches right handed, since that is my dominant hand (writing, eating). I used my dominant eye (left) to sight with, and my right hand to shoot with. On my third match, I was dealing with some neck issues, and had a hard time using my left eye, so I said WTH and decided to shot the match with my left hand. (My left hand "knows" how to work the gun, ie, load, unload, pull the trigger, etc.)
That match was my best match, by 20 points. And they kept getting better, so I now consider myself a left handed bullseye shooter.