Having been active LE during the the 70s on, on the pistol team and interested in all things like what guns are in what holsters, I never heard of any department that issued the model 29. I could be that a few small agencies did, that I would never hear of, but I never heard of a large agency doing so. I do know of, or heard of, individual officers carrying the model 29.
At one time in the 70s, Remington produced a police load .44 Magnum round, with a 240 grain bullet rated at around 1000 fps, sorta like the police .41 Magnum load. I carried that load in my SWAT gun, as we were allowed a wide latitude for handguns on swat duty.