Ray I have found your last post here to be true and correct.
Before I got my doubles I had only killed 2 deer with Iron sighted rifles. When I first started hunting with my iron sighted doubles I simply did not have the confidence in iron sights that I had with a scope. After using them for a while now, on many occasions I will remove the scope from my 9,3x74R double and use the iron sights because in many situations I PREFER the iron sights. For example my black bear over bait in Idaho.
It is all a matter of using iron sights enough to have confidence in them.