rcmodel said:All modern DA revolvers are set up from the factory with springs that insure 100% reliability under extreme cold, dirt, or other adverse conditions.
Lightening the springs can make for a lighter trigger, but a far less reliable gun under adverse conditions you might most need it to work.
I mostly agree with RC, but wouldn't want to go so far as to discourage you from looking into a quality action job if you were thinking of it.
Lightening the spring can lead to reliability issue, but not automatically so. Smoothing of the action by a good 'smith can make an action feel lighter. And a little lightening the action can make a big difference without getting into reliability issues. J-frames are tougher to tune without loss of reliability, since, because of their size, they lack the mechanical advantages of the larger frames.
rcmodel said:Lighter springs can result in delayed trigger return in fast DA shooting that can stop you in your tracks
This is usually a user issue - it normally happens because people are in the habit of letting the trigger push their finger forward on the return. It's a bad habit that usually stays hidden until the action's lightened considerably.
If the trigger has trouble returning on it's own, it's likely someone willy nilly messed with the main & rebound springs without making any attempt to balance them. When properly balanced like they should be (and the internals properly smooth), the trigger return shouldn't be an issue.