Rule303, the 4" M29 S&W recoils almost straight back, with very little muzzle flip.
You feel the concussion on the chest, quite different from the longer barrels. Even the 6" and earlier 6 1/2" have muzzle flip, whereas the 8 3/8" really seems to climb.
I've shot mine with full power loads many times in timed and rapid fire courses.
Unlike Jerry Mickeluk, it took me 7 or 8 seconds to get off 12 rounds.
When it was legal, I always carried 2 speed loaders, giving me 18 rounds total.