My wife is new in the last year to shooting. The gun that feels the best in her hand is the 9mm Sig P226. She shoots MUCH better with DA vs SA with this gun. She also has a 686P revolver that she shoots only in DA and is acceptably accurate (all rounds on a 8" plate at 25 yds). Does anyone have a diagnosis for the significant accuracy differences between DA and SA? Where should her finger be on the Sig trigger for DA and SA pulls? Any other tips to improve SA accuracy? Thanks for the input.