In the meantime, I am over 70 years old and have been forced to wear glasses for years anyway. I find it very difficult to shoot over open sights.

I have had a scope on all my big game rifles since the beginning, meaning bolt action rifles caliber 10,75x68, 11,2x72 Schüler, 460 Weatherby Magnum and 12,7x70 Schüler. I also have a Rigby-style diopter on the rifle caliber 12,7x70 Schüler, which simplify a lot when it comes to shooting over open sights. Only the two DR caliber 577 Nitro Express and 600 Nitro Express have no scope, which makes it difficult for me to shoot with them nowadays.

In summary, without scope I would have some difficulties in getting a good shot placement, no matter what caliber. Only at very short distances I still dare to approach dangerous game with a rifle and open sights. Anyway, under these situations you have no other choice.