Unlike 686 It has adjustable sights, doesn't it?The one I will never, ever sell is my 4" S&W Model 681.
I have a Performance Center's M66 with 3" compensated barrel which is smaller K-frame and it shoots full power .357mags no problem. I limit it to occasional shooting only as it has a weaker cone presumably. However after hundreds of 357 magnum rounds through it is as solid as new. Perhaps new metallurgy made it a no issue.
As for the best .357mag reliably shooting thousands of rounds through nothing beats Manurhin MR73.