If you use heavy loads and shoot them a lot, the S&W will shoot loose.
I shot sillhouettes for a number of years. I used S&W's, Rugers, and Dan Wessons. In the end i stayed with the Smiths.... Why? Because it was easiest to shoot, came out of the box closer to ready to shoot, and because i won more matches "by far" useing Smith M-29's.
What you said is true, but you have to shoot thousands and thousands of full power rounds through a Smith to get it shot loose, and it's doesn't take a rocket scientist to tighten it back up!
I had a Ruger fail on me once, and by the time i got the D.Wesson shootable, i could have "tightened" up a Smith several times! To this day, i haven't had a M-29 fail, and since 1975 i've tightened up two of them.
Make mine a S&W please!!!
Drilling Man