But it may not be a good idea. The factory spring is strong enough to fire the hardest primer in the roughest gun.
I would not reduce the mainspring in a carry gun without work done to reduce friction in proportion.
Gotta tell you that I have both Smith and Colt revolvers but a recently purchased Dan Wesson 715 has the smoothest, shortest double action pull I have yet to experience plus I can have it with a 4, 6 or 8" barrel. I'm amazed that the DA groups are almost as good as the SA ones, Only gripe is trying to find Roper style grips for it.