While practicing last week using a mix of plated and lead bullets loaded down to about 115PF in 38spl cases I had the following happen and not for the first time. Grit got under the star exrtractor and the cylinder wouldn't close. Problem was solved with a cleaning brush. I keep this area dry with no lubrication. This happens after less than 50 rounds. I have had it happen before with this gun yet never with a S&W. Is there something in the Ruger design that causes this to happen or is it just a fluke and likely won't happen again soon.