Very few normal shooters had trouble with the earlier Model 29s, but silhouette competitors who went through thousands of VERY hot loads every year did have problems. Apparently the cylinders would rotate past the bolt notches and the gun wouldn't fire unless the shooter re-indexed the cylinder manually. (An hour spent on the S&W forum will answer any question you ever had about the issue.) The problem largely went away when S&W added the Endurance Package starting with the Model 29-3 but by then most high-volume 44 users were shooting Rugers. Most Smith guys still feel like the 29-2 and earlier guns are at their best with a bullet no heavier than 250 grains going no faster than 1,100 fps.
Not sure if the Endurance Package was ever added to the 41-caliber guns.
Okie John