Originally Posted by tomingreeneco
When practicing if you accidentally dry fire on an empty chamber you can damage the firing pin. This will not happen with a snap cap.
I think you will find this only applies to rimfires where the firing pin can strike metal. Early on Ruger had a display with an early Single Six set up with a machine to cock and dry-fire the revolver, counting the number of times the gun had been dry fired. At the close of the show the count was in excess of 10,000 times.
As for me, I prefer the empty chamber.