I can hardly see my metallic sights anymore. I have noticed and even now notice that some metallic sights are easier to see than others, at least it is easier to get a good sight picture. I don't know why exactly that is, but I really liked the sights on the BLR centerfire rifles and the sights on Contenders. I could see the old style bead front, U notch rear on the old 552 I had much better than the new models. I think it is all about reflections and the definitions of the rear sight particularly and maybe the relationship of the front sight in the "notch" on the rear sight. I have a Remington Model 12 with a shallow V that is fast, but I can't be very precise with it. Of course, peeps are easier to use as your eyes get older.
I try to make sure that I can scope anything that I buy nowadays, just to be sure I can continue to shoot it. When I get to blind to shoot, that will be a very sad day.
Ej