Yes, the S&W Model 624 tends to be a bit lighter than a Model 629 (44 Magnum) but it is really the same size, a full size N-frame. The Model 624 generally has a trimmer barrel that reduces the weight.
The S&W Model 69, an L-frame, is smaller than the N-frame guns. Since the Model 69 has been out for several years without any noted problems, it seems that S&W has done their homework and made a smaller revolver that can handle 44 Magnum level ammunition.
Ruger's GP100s chambered in 44 Special should also be capable of handling any 44 Special ammunition. Regardless of Ruger's reputation for strong, reliable firearms, I will not shoot over charged 44 Special ammunition in my GP100s.
I enjoy shooting 44 Special level ammunition in my S&W Model 69 and my Ruger GP100.