With one important exception, the combat reload. It is magazine capacity and the ease of rapid reloading under pressure that gives the edge to the automatic for service use.
Proficieny is the key, as a semi auto reload can be botched pretty easily too. I am embarrassed to admit that I tried sticking a magazine in my 1911 ... backwards
. And I was relaxed and calm too. I am actually more proficient reloading my 686 with speedloaders than my 1911, so I can reload a bit faster with my 686.
Plus I can shoot it better too.
Now for personal self-defense use, a revolver may be perfectly satisfactory -- but remember, the primary cause of stoppages in actual engagements is running out of ammo.
That may be true, but I lean more towards the
other primary failure I hear about: running out of time.
Weight isn't everything. The followup SA shots from the semis I've shot have had horrible, grainy triggers compared with a wheelgun's. A tuned Smith or Colt will have a DA trigger pull like liquid velvet and can fire faster than a semi can cycle. Indeed the superior triggers are one of the main reasons I favor revolvers, and one reason they're so fast to fire. Only a 1911 or similar SA C&L semi can really compete with them in the trigger department.
Well said, though I do acknowledge RyanM's point as well. To me, a super slick revolver trigger at 8 to 10 lbs DA will feel lighter than a 1911 with a gritty 6 lb pull. Of all the autos I've shot, only the 1911 comes close to a nice DA wheelgun in my book. Now, I admit that my S&Ws all have stock DA triggers (no tuning or polishing), so I'd rate the quality of their DA pulls as "acceptable" to "decent", though I'd like for them to be made "Superb" by a reputable smith one day.
Back to the OP's question. I choose to carry a revolver, a S&W 642 (most of the time) simply because I shoot revolvers better. I do carry a 1911 occaisionally as it is a larger, easier to shoot platform. Though I have outshot the 1911 with 642 once or twice, which is why I've added an intermediate sized revolver to my wish list for IWB duty.
Shot placement trumps capacity for a citizen like me, IMO. If you shoot an auto better and are more confortable with it, by all means, pack one! More rounds are nice, but choosing capacity for the sake of capacity alone is a mistake.