Yeah, I had to admit to myself about 5 years ago that the notches on barrel mounted rear sights were made for 20-somethings, not for 50 year-olds.  If I'm going to use iron sights out to 100 yards on the varmints, I need a receiver mounted aperture.

Update a couple hours later:
I got to the range and did some shooting at 50 yards.  Rear sight was at its top setting, full height front sight blade.  I fired 3 of my reloads and one Winchester commercial round.
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Now it's time for some front sight height adjusting.  My goal is to have the commercial round hit .5" high at 50 yards when the rear sight is in the lowest position.  That'll leave me enough rear sight adjustment to zero my handloads at 100 yards.  Break out the file and the calculator!