Steve,Steve said:Increasing your hammer spring tension is going to change your point of aim. (I found this out at NRA Nationals in 1997. My spring broke and was replaced with a new one.) It is also going to wear on your firing pin and firing pin spring more. NO good will out weight the bad points here.
You can dry fire the Contender all you want. Just don't cock the hammer. Opening and closing the action will set the trigger. You can check trigger pull, creep, etc without ever having to cock the hammer.