Took my Model 64 shooting today for the first time since I tried to correct the problem I had with the cylinder locking up last time. After removing some burrs from the ejector star, I thought I had it in good shape, but ran into the same issue again, using WWB ammo. It looked like all the cartridges seated properly, but after the first shot, it locked up again. Switched to some Sellier & Belloit fmj, and the first cylinder started to act up a little bit (opening it and closing it seemed to take care of it), but then the rest of the box worked fine. I'm still kind of stumped. I've had a semi-auto balk at WWB ammo, but never would've thought it would give a revolver problems. Not sure where to go from here. Guess I'll just keep trying other ammo types and see if the problem creeps up again, or whether this gun just doesn't like WWB. If it starts doing it again, it may be time to take it to a professional.