The .380 (9mm
Not much power here, but a well regarded round in some circles. This is
probably the minimum round which could be considered useful for defense.
The Wather PPK, and it's famous user, James Bond made this round famous.
This is essentially a cut down 9mm for use in smaller "pocket Pistols".
There is little leeway in reloading because of the straight blowback design
used in the pistols which fire this round. This tends to make the little
cartridge uninteresting for the reloader, as you are pretty much limited
to reproducing the standard factory loads. Hollow point bullets are offered
for the .380, but they are of little use as the cartridge does not generate
the energy required to make them expand. It is possible to coax 1000fps
out of this round, but not with any of the powders I use, and not with
any degree of comfort.