I have put thousands of rounds of cast boolits only thru 5 different 629's that I still own. I've had a few minor "issues" with most of them, but nothing I couldn't either fix myself, or send back to Smith for them to fix on their "nickel".
1100 rounds so far, about 10 240gr factory JHP and the rest my handloads. I think I am going to settle on a 240 LSWC over Unique 10 gr, so a medium magnum load, which did about 1080 or so out of the 4" barrel.
Hopefully I will work up to controlling the 2400 19 gr load a bit better. And that isn't even max.