If it was a competition piece I wonder if it had been chamfered too hard. I've seen some clip guns that had some extensive chamfering and they still worked because clips. No clips, though, and there's just not enough extractor left to get the empties all the way out 100% of the time.
Generally S&W puts a very conservative chamfer on their cylinders advertised as such. I presume this is the reason the ends of the fingers aren't touched, so it looks ovular compared to what go-fast smiths will put on a clip gun like so.