S&W 617 Dry firing
I have also dry fired my 617; however only rarely.
I was curious about the factory policy on this issue & called S&W
Being one who has always thought it harmful to dryfire rimfires I have not used the same degree of caution on centerfire guns,thinking that the firing pin doesn't contact the edge of the chamber seemed to rationalize this.
I was told by the customer service person at S&W that rimfire products of their manufacture are " not to be dry fired!"
It was further stated that centerfire handguns of their make "may be dryfired without causing damage to the gun!"