You can lighten it considerably. It just depends upon what you want to do with it. I use most of mine for competition shooting and my 686's and 625's are down to 5.5 & 6lbs double action pull. They are 100% reliable, but I only use Federal primers on my revolver reloads.

If you are going to be using factory ammo then you will want to go no lower than 7lbs double action pull.

Find a good revolver gunsmith who can not only polish, but smooth up your trigger action and tweek your springs. It pays to research and find a good revolver gunsmith...they are getting harder and harder to find.