In a semi, if the round doesn't fire, the slide doesn't come back to eject the round..and you effectively have a club! I'll take my chances w/ a revolver that it isn't a hang fire if I'm caught shooting to save my life. If I'm at the range, I wait the 30 seconds...
First of all you have a much greater chance of being in a car accident on the way to the range than a hang-fire. Hang-fires are rare but on the range(as everywhere) safety is first. However in the situation of self defense which is what I was refering to the risk of a hang-fire is tiny compared to the threat (man with a knife, tire iron or whatever) that caused you to draw and fire your gun. Haveing been there I can assure you that you keep pulling the trigger till the threat is gone and I guarantee the risk of a hang-fire is something you do not think about at that time. And duds do sometimes jam in a semi-auto. Just because I prefere wheel guns doesnt mean I dont like semi-autos and I have(do)owned some. Like everyone on this site I have my like and dislikes.
I think most hang-fire's seem to come from old or reloaded ammo; bad/old components used in reloading; bad/old powder or primers, or moisture/oil contamination. That sort of thing. That's another reason to use only factory ammo for carry purposes.