A few weeks ago I asked a question about how to run wood base around a round sheetrock cornerbead, and got some good suggesstions. I have since finished the project, and thought I would share the results. See first post for details.
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OK, I'm going to try to attach a sketch. Here's the details: Assuming the wall is flat plumb and 90* square (aren't they all?), cut the base so it stops either flush or about 1/16" short of the opposite face. It will work with up to about 1/8" gap, but more than that is a problem, and flush is almost a problem, so shoot for 1/16". Of course you have to cut the miter at 22-1/2*. As shown on the attached sketch, the resulting filler piece (the hypotenuse? the chord length?) should be about 1-1/8" long. If the dimension is 1-1/4" or more, the back side of that filler piece starts to interfere with the cornerbead. If it is less than 1" then a gap starts to appear between the filler and the cornerbead. This assumes 3/4" thick base material. If the filler is more than 1-1/4" then you need to consider making two filler pieces, all with 11* cuts. This looks neat, but very awkward if you have both one and two piece fillers in the same room.
Ok, let's try that sketch one more time...