I can offer one trick that can help in one situation, when the joint is open slightly at the face, but tight at the surface of the case. I've also used it on ogee bracket feet. It is typically caused by the cabinet being slightly narrower* at the back than the front, or the molding being cut a smidgen less than 45°. Make sure there is plenty of glue in the joining mitered surfaces. After you have clamped and pinned both pieces of trim, but before the glue sets, just burnish the outside edge of the joint with your scraper burnisher, pushing the ends of the show surfaces together.
*or significantly narrower in the instance of a tall case clock.
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- Making and installing mitered molding *PIC*