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I stand the moulding up like the miter saw fence is the wall. Cut it square first. Lets say you are making a return for the right end of your moulding. Cut a 45 left, off of a long piece of trim with the intent of using the piece you cut off as your return. The piece you cut off needs to be a perfect triangle when viewed end-on. If it's too short the return wont reach the wall. If it's too long, it will have a little flat part left on back and being too long it will push the chair rail away from the wall. Cut slowly as the blade finishes the cut and let the piece gently fall away. (The blade likes to fling those small pieces at your co-workers which really pisses them off).

Once you have the perfect triangle return cut, then you can swing the saw around and cut a 45 right, and glue them together. You usually want to use some 23 ga pin nails to help hold it into the glue. Or just tightly tape it up for 15 minutes or so. Some guys just shoot the large piece on and then they force the return in along with some glue and let friction hold it.
 
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