How would you neatly and consistently round over the ends of dozens of 1/2" dowels?
Doing it by hand with sandpaper is a nonstarter. Also I don't have a lathe :-/
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I'd probably chuck them into the drill press and take a rasp to them. You could get it consistent by using a consistent technique, and checking them against a gauge (e.g. cut a profile in a piece of cardboard).