I've always believed it was OK to dry-fire any centerfire S&W revolver. In fact, have heard that it's good for the gun to do so....smooths out the action. I've also believed....and I'm sure that it came from being a member here....that you should not dry-fire the rimfires. Sooo....I have never done that. No reason to start now. I think Lee's post was very informative. How can you argue with the people that made the gun?