I like the CCI Blazer 200gr Gold Dot JHP in .44 Special ($12.86/50 @ 'Academy' chain stores.), although I have had one Al case of this type split, making case extraction difficult in a SS cylinder (696). Chrono-ed at the same velocity, and using the same low-speed Speer #4427 bullet (Reliable opening at 800fps, reportedly.), the Georgia Arms version is loaded in new Starline .44 Special brass and runs ~$19/50. I now keep those in my 296, although I shot ~1,200 of the Blazers before the 'problem' (In fairness, I have shot many thousands of 9mm, .45 ACP, and even .45 Colt Blazers with absolutely no failures of any kind.).
For reloading, I use 5.7gr of Titegroup, midpoint from Speer's literature, to mirror those velocities. I got 870-880 fps from my 629MG with the Blazer/GA Arms ammo, a little slower with my homebrews. I use Ahrends rounded non f-g cocobolo stocks, a la the 329PD, on my 629MG - a great fast grab and efficient for any normal .44 Special/Russian use. For .44 Magnums, and the 629MG is a real .44 magnum, try the new .500 Magnum Hogue backstrap-enclosing X-frame grips from S&W - ~$35 (Fits K/L and N frames, too.). Enjoy your 629MG - a real treat. And... they are available again from S&W - for a little while!
Stainz