While it's no .44Mag (I've loaded 185gr jhp to 1750 fps through my Super Redhawk - I'd never fire that in my 629!), you can get CorBon 165gr JHP @ about 1150fps, and W/W and CCI have 200gr loads at around 900 fps.
Not too bad.
Mark
Hey, since we're talking about .44Mag and 629s, anybody have any idea how much a Power Special 629 Grand Master might bring? It's in good condition, and with me being out of work, if I don't get a job soon, I may think about selling some of my collection, at least those that I haven't shot in years. Ron Power builds (built, actually, as he's retired now) some of the best S&W actions around.
Mark