Isn't it recommended that you not dry fire one with the firing pin set in the hammer?
Actually more likely to break one of the aftermarket ones in the more recent frame mount style. Some of those makers specifically recommend snap caps with dry fire.
If you're going to dryfire a centerfire a lot, by this I mean ten's of thousands of times a year, I do recommend snap caps. That's for both the hammer mount and frame mount firing pins.
GTG's comment about the effects of fast double action on heavy cylinders is to be heeded. Back in the days of bowling pin match popularity, it was common to see problems with the big N-frame revolvers, due to exactly that effect.