Maybe I'm a weird case but my Match Champion often gets the extractor star lockup after only a couple of cylinders. It won't close or closes hard and gets very draggy. I can consistently fix it by wiping/brushing under the extractor star.
It's a bit confidence-wreaking when I'm doing reload drills and can't close the cylinder. The MC was not really intended to be an everyday serious defensive gun for me but this rules it out completely.
I practice with factory FMJ 158-grain FMJ and some of the brands I've tried are admittedly pretty dirty. The sights are dialed for .357 SJHP and nothing lighter hits close to point of aim.