One of the most accurate rifles I ever owned was a BAR in .338. I would practice on ground squirrels with it and it was as accurate as my eyes could use the iron sights...about 150 yards on a ground squirrel sticking up out of its hole.
You must have good eyes.
Time was, when I was a good shot with iron sights. However, a couple of recent misses (easy shots at whitetails at ~50 yards) have brought home the message that my eyes are too old to do it anymore. Bought Leupold scope, no deer is safe now, freezer is full of venison.
can you spare an eye bro?