In general, compared to a lot of other woodworkers I'm not a fan of or skilled with hand sanding. Sometimes I use a 1/16" round over bit, but at that small scale you really aren't very aware of the shape, whether it is round or a chamfered 45 degree flat. Doing it with a block of wood and sand paper is very easy and quick. Try it on a piece of scrap with an edge one or two feet long. Stroke in the direction of the edge.