You will see numerous posts that say go ahead and dry-fire all you want, except rim-fires. S&W even says it is OK, of course they do, they sell parts and service!
With a center-fire revolver you can usually get away with dry-firing for years, but it can cause damage to the gun too! You will see burring to the center hole of the hammer nose bushing, loosening of the hammer nose rivet in the hammer of guns with the hammer-mounted firing pin, and breakage of the hammer nose. You may have firing pin breakage of guns with the frame mounted firing pin too.
Believe it or not there is actually more strain on some parts from dry-firing than shooting, Because the hammer is not cushioned by striking the primer there is significant shock to various frame components. What may also be seen, that most just wonder "what happened" as a result of excessive dry-firing is breakage of the hammer stud and trigger stud.
While parts breakage is not commonly seen, dry-firing does contribute to it! So go ahead and dry-fire all you want and expect there to be consequences in the future. Snap caps are always a good idea, and do no harm.