I have carried snubbies with an exposed hammer, but after having enough examples of hammer snag, I would recommend the hammerless versions. I have, and will carry the M638 which has a shrouded hammer, but my preference is the M642. You can have this little revolver rolling around in your pocket and the hammer won't catch the fabric as it is withdrawn.
S&W M642 DAO Only
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S&W M638, shrouded hammer
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These older Detective Specials, they were actually carried in holsters by Law Enforcement. The shorter barrel made them easier to carry, but, if carried differently, there was always the risk of the hammer snagging when drawn.
Colt Detective Special
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It is my considered opinion, having shot snubbies for fun out to 50 yards, is that these are close up pistols only. Basically spitting distance. I have hit my 12" gong at 50 yards standing, but, not that often with a snubbie. If I can hit the gong more than 50% of the time at 50 yards, offhand, at 50 yards, I think I am doing great. At 25 yards I can keep all my shots on a 12" gong single action. Double action is an entirely different thing. It takes a lot of work to keep a cylinder full on target when shooting double action. There were shooters who were just amazing shooting double action, but I am not one of them! But, move the target within arms reach, just point and squirt!