FWIW, there was a guy on another forum documenting the use of his Model 66 with the updated forcing cone, with a steady diet of 158gr .357 Magnum loads. He got in to the thousands, then just stopped updating, as it was quite uneventful.
I love the way that bluing looks, but for a woods gun, I would be more inclined to get a Model 66 for the greater corrosion resistance with less maintenance. Due to modern environmental regs, the modern bluing isn't as durable as it used to be. Even back in the days when they could still do it, stainless was a big, high-demand, selling point when the Model 60 came out in 1965.