Definitely depends on the gun. My Ruger Super Blackhawk .44 magnum specifically says in the manual that dry firing causes no damage.
Beautiful gun. I will add it to my wish list.
Was that gun stainless when you bought it or was it blued?
The reason I ask is I have something similar that was blued and had a minor touch of rust on it, so I stripped it, and now it looks stainless, but I need to keep it wrapped in a well-oiled cloth.
I tried to re-blue it but was never happy with the results.