So, there must be some since it appears to be the recommended way if using a scope. What are they? The only one I've heard is that you can sight the target with the off eye. Depth perception?
The kicker for me is that I'm going blind in my left eye so about the only thing I can see with that eye open is the end of the rifle. I can't be the only person with such a handicap; so what are the reasons then?