If target dimensions have an especially good fit with ones sights, it's quite possible to shoot much better than one can see. Never thought I could do less than one moa with irons until I picked up a Sharps with high end sights. It probably helps that the sight plain is about 37 inches from front to rear.
I used to know a HP shooter who almost made Master back in the M14 days with coke bottle glasses. He told me--"you don't have to see the target well, you just have to see it the same way every time".
