Seems to make sense, I wasn't thinking about the fact that the ball is going to obturate just as a bullet does, so it probably won't do anything at all to help.

But since I am already set up and tumbling about a dozen balls inside a piece of 2" PVC pipe on the lathe here at work as we speak, I will go ahead and let them run just to see what happens. They have run about 30 minutes so far and it looks like they are smoothing up. It very well may end up just being academic, but at least I will have satisfied my curiosity. Never know when some piece of arcane knowledge might end up being useful.