... So many in fact, that both Smith and Wesson and Ruger dedicate a large amount of their production to the J frames and SP101's and LCR's. .....
Let's not confuse the issue. These small guns are popular because many of us are unable to conceal larger guns. For instance it is hard to conceal carry a full size gun when the temperature averages in the 80s and 90s and typical year round dress is shorts and a T-shirt. Many are also limited by their work place and have to be very discrete about what they carry. Either way a small pocket pistol or revolver can fit the bill; but, that doesn't make them an ideal choice for an inexperienced shooter who wants to learn the basics.
These pocket pistols tend:
1) to have very heavy trigger pulls - for instance the factory setting on my model 60 was 18 lbs for a double action pull.
2) the sights are often less than ideal. They are small and the sight radius is short
3) they are not very reliable. They operate on tight tolerances and things like limp wristing a shot can cause a failure to feed/eject.
4) often there is not much to hold onto. You may only be able to get one or two fingers on the grip
5) Felt recoil can be heavy. Which is generally not a problem, unless the design of the frame is such as to make that recoil painful. I had to modify a p3AT that was so bad it would blister my palm after 25 rounds. The factory grip was like a plastic rasp.
6) Some also have very stiff actions. The Beretta PICO was so bad that a lot of users were unable to pull the slide back to load a cartridge. The factory had to issue a recall and modify the thing.
7) then you have the S&W bodyguard which had a tendency to misfire due to light hammer strikes
8) even the Walter PPK has an unfortunate safety location on the back of the slide that can cause the user to engage the safety as they rack a round.
It is not easy to come up with a really good tiny gun. They work, but they can be finicky, which is why I would feel they are less than ideal for anyone, unless they have a specific requirement for such a gun and are willing to train to overcome the problems. There are certainly better choices out there for home defense or casual target practice. Although, yes, you probably won't need a massive amount of rounds to defend yourself and just about any caliber can work so long as you do your part and hit the target.
n2s