Another magazine recently had an article on using .22LR for training, and a side bar article about an Israeli CT operator whom, in two separate incidents, took out two armed terrorists with his .22 cal. Beretta Model 70S. Both incidents were actual firefights. The moral of the story was to train to be competetent and confident with what you carry. A five shot J-frame (or a Charter or a Ruger for that matter) is just as deadly as a high cap wunder gun if the shooter can score hits in vital areas.
Some may knock the bullet capacity of a five shot, but I've run into plenty of gun toters carrying hi cap pistols that don't bother to carry a reload for their primary pistol thinking that fifteen rounds ought to be enough to handle the situation. If your mag has decided to malfunction at that defining moment, the best you've got is a single shot pistol and the hope that your one shot was placed accurately. Once in competetion, I watched a Border Patrol Agent who shot on the National pistol team reload his duty Model 66 with a speed loader faster than many can reload their semi. It is a matter of training yourself, and not just on the range. Drawing, dry firing, and reloading (safely with dummy rounds) can easily be accomplished in the privacy of your own home. There have been incidents where people with a total lack of training have prevailed when thrown into an armed encounter, but wouldn't it be better to err on the side of caution and work with what you have at hand.
What I found especially interesting about that article was how Ayoob described the old Marine's self critisim of how he handled the situation, of his equipment, and his carry methods. Don't wait for a critical incident to happen to test your ability or how well your equipment functions. In the end, I didn't see anything wrong with how the old Marine handled the situation, and he'd have probably been just as well off if he's been carrying a five shot instead of his .45.