As RT noted, getting out to 200 will be a trick unless you get the deer to hold still while you adjust your scope.
I set up a 629 Comp for my Dad last fall and installed an UltraDot red dot sight on it. I played and played with ballistics programs and data, and no matter what you do or how you sight it in, getting beyond 120-130 yards WILL require you to adjust the reticle. In the end I have it right on at 100 yards, and after that it just drops like a rock. Even sighting it in at 125 or so doesn't help much. FYI I was using the Hornady LEVERevolution with the FTX bullets - about the best BC you're going to find for a 44 Mag.
Also note that your energy drops significantly out there. Again, 120-130 yards is probably the max.
The group at 100 yards is incredible. Blew away all the other guys at the range - they couldn't believe I was shooting a 44 Mag pistol at 100 yards and how small the group was. My own 629 is not much different.