I have an S&W 442. I've noticed that in the last few range sessions I'm having trouble getting the spent shells out of the cylinder easily. They seem to be sticking, or at least some are, requiring some pulling; they certainly don't just fall out as they do with my Colt Lawman Mk III. I thought I'd been keeping this gun clean and lubed. What's up with this and what should I do to rectify the problem? I do use a nitro solvent on bore and cylinders along with BreakFree CLP. I almost shoot fmj rounds for target practice, by the way.