I carry a Kel-Tec P3AT in .380 ACP... a 90 grain hollow point bullet at 1,000 fps... not a "giant killer", but not something to be ignored either.
I looked at the new 9x19 model that Kel-Tec just came out with... and it's somewhat larger and considerably heavier than the little 7.5 ounce P3AT... and so, I'll continue to carry the P3AT, not because I wouldn't prefer to have one of my 1911A1's with me if a bad guy decides he wants my wallet more than I do, but because the 1911A1 in .45 ACP is just too darned BIG and HEAVY for comfortable, easy carry !!!
The little Kel-Tec is light, has a light, very manageable recoil and is small enough to put in your pocket and not give itself away by it's size and shape in your pants pocket... and it carries 7 shots, not 5 or 6 shots... one in the pistol's chamber and 6 rounds in the small, handly magazine and is a true 9mm (.355 caliber) diameter bullet.
In Europe, many police departments still carry the .380's which are called "9mm corto" or "9mm short" and are, in European designation, a "9x17" (9mm or .355 caliber bullet with a cartridge case length of 17mm's) as compared to a 9x19 Luger or Parabellum.
That said, I've advised a fair number of people who aren't shooters and rarely if ever shoot a handgun to get and use a .22 rimfire pistol or revolver. For a woman who may not have the strength in her hands to function the slide of a semi-automatic pistol, I often recommend the Beretta .22 rimfire semi-automatic pistol with the 'tip-up" barrel for the ease of initially loading the weapon's chamber.
Let's face it... three or four .22's in the chest or head is a whole LOT better than a total "miss" with a heavier caliber gun.
Another GREAT advantage of the .22 rimfire is that it's inexpensive ammo with which to PRACTICE... and with practice comes better marksmanship... something to be strongly considered !!!
Strength & Honor...
Ron T.