I don't dry fire without snap caps ..... centerfire, or rimfire. This is simply how I look at it.......
A firing pin has a functional distance of travel. If the firing pin is an intregal part of the hammer, and does not impact a cartridge case, another part of the hammer, or firing pin block receives the impact. If the firing pin floats, and does not strike a cartridge case, a shoulder on the firing pin, or another stop device must prevent firing pin from extended travel. If the shoulder or stop device is designed to allow dry firing, hooray, and the manual should say so. I tend to protect my firing pins from hammering against their respective stops.
Dry firing is an excellent parctice tool, but I just prefer to use snap caps, as I think it's easier on the firing pins. I"m not saying that anyone else should. Y'all suit yerselves....