I own numerous S&W revolvers and I have come to believe that if you plan to shoot double action that most S&W revolvers need, or critically benefit from, a trigger job. Trigger jobs usually involve changing the mainspring. I have had great results with both Wolf and Wilson Combat mainsprings. Polishing up the insides can also be of benefit. S&W revolvers ship with 11-12 pound triggers. I submit that this is simply too much for very accurate double action shooting. It is for me, anyway. I usually have my trusted gunsmith try to get it to 7-8 pounds, which I find makes a huge amount of difference in terms of accuracy. And yes, I insist upon 100% reliability as regards ignition of all types of ammo. It can be done. All of my revolvers are about 100% reliable with all primers and available ammo. But that reduction in the trigger pull, in my experience, makes a big difference.

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Army veteran, NRA Life Member