I am right handed, but left eye dominant. When in the military and I attempted to qual, I would get through about 3/4 of my shots with a long gun and then pretty much close my right eye because I could not keep it open any longer. One day one of the firearm instructors saw this and had me switch to firing left-handed, I had no issues and shot expert each time after that. I still fired a hand gun right handed, but just sighted it with with my left eye. People kept telling me I was doing something wrong with my long gun slung over my left shoulder with my sidearm on my right side...but that's what worked for me.