Defensive Ammunition Optimized: Federal's 30 Super Carry | An Official Journal Of The NRA
The last widely popular pistol cartridge intended specifically for concealed carry was the .380 ACP, designed more than 100 years ago by John Moses Browning for the 1908 Colt pistol. I have often looked with mild frustration at the .380 and the ubiquitous 9 mm Luger, our two most common “carry” pistol cartridges.
Source: americanrifleman.org