I've searched this forum and the internet, and I haven't found anything to support damage from dry-firing a modern S&W revolver which is in good working condition.

Cylinder stop skipping from high-speed cycling will happen loaded or not, if the revolver is old, worn, or has tired springs, or has intentional late stop engagement.

I've seen numerous references to the firing pin striking the cylinder with extended firing pins, but none with factory. I've dry-fired all of my S&W 22's, some extensively, only one has a firing pin mark on the cylinder, which was there when I bought it.

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Mark