S&W Model 29 with 8 3/8" barrel.
Mine's an S&W 042 Centennial, a hammerless airweight in .38 Spl.
I've also been known to carry an S&W Model 19 in a shoulder rig, either 2.5" or 4", depending on my mood, or also in a shoulder rig a Model 28 4" or a Model 58 4".
The 28 and 58 really aren't regular carry guns, though. They're simply too heavy and bulky for long-term comfort.