There's an archived thread here (http://www.thehighroad.org/archive/index.php/t-187371.html) with an excellent discussion of the mechanical issues. One thing that's missing, however, is the circumstantial/human element. Seems to me there are two different circumstances, one where a revolver is better -- close-up self-defense against urban criminals. For combat shooting, the semi-auto is better. Here's a real-world case for the revolver: A female co-worker in Dallas years ago told me a harrowing story -- her car broke down on the freeway between Dallas and Ft. Worth at night. Long story short, she was abducted by a purported "Good Samaritan" who drove her down a dark dirt road and attempted to rape her -- he hit her, opened her passenger door, knocked her to the ground. It was dark. Before he mounted her, she pulled a .38 snubbie from her purse and shot him point blank in the abdomen. He rolled off, she took off running. They found him later sitting in his truck, passed out from blood loss. Little doubt that, with no attempt to hide his face or license plate (he sat behind her stalled-out car for awhile), he would have killed her after getting his rocks off. Point is, what if she had had a semi-auto, and forgotten to chamber it beforehand? Could she have done so with one hand out of commission (the assailant's body pressing against her)? What if she pulled the trigger with the safety on as the guy feels it against his belly, and grabs it from her? What if it had jammed? They say you lose half your IQ in an emergency, and it's true. People also do incredibly stupid, neglectful things (a BASE jumper in Moab a few years ago plunged to his death -- investigators said he hadn't even packed his chute, or packed it properly). No doubt the simpler .38 revolver saved her life. But if I were a police officer, or lived in a neighborhood infested with Crips and Bloods gangs, or the zombie hordes arrive for the apocalypse, then I'd want a semi-auto for hitting multiple perps at a distance.