I own a 686 CS 3". I have put somewhere in the neighborhood of 15k rounds through it of .38 +P and about 5k rounds of .357 Magnum. The cylinder release latch screw came out (I attribute that to handling) and the ejector rod came loose (backed off the threads). I shoot this gun exclusively in IDPA now although I used to carry it daily. The ONLY modification to this gun has been to paint the front site.
I have tried to shoot Rugers, the single action is fine, double action has a "false" reset when compared to an S&W trigger. For the purpose of competition shooting, I found that undesirable. For the purpose of self defense, I find that unacceptable. Perhaps if I had started shooting a Ruger first, it wouldnot have been a problem for me but, I didn't, so it is.
As far as the ability to handle heavy loads, right about the time I got the pistol, I started to handload. I made a mistake, and double charged a round. Instead of 5.2 grains of W231, I had 10.4. To say the least, I was surprized to see my hand still attached to my wrist, as well as the 686 still in the same condition as before discharge. I still have the 686, still shoot it. I also still have the case at my reloader, split side and bulged primer, as a reminder.
Wheeler