I have used .040 I now use .045 and polish. If you do decide to change your spring please be sure that you keep it tight and check it regularly. The sping must have enough preload to keep the trigger "shelf" against the sear when in the cocked position. If not the chance for unexpected firings goes way up. There is a lot of responsibility that goes along with lightening the pull weight of a non accutrigger savage trgger.
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