I guess if you need extreme concealment, undercover cop or similar where it must stay hidden, they make sense. Or if it is just impractical to carry anything bigger. But I question how easy it is to hit anything with one, except maybe the longer barreled versions.
Wasn't there a NAA cartridge a .25 NAA - a .32 ACP necked to .25? It supposedly had better reliability than a rimfire, and better velocity than a .25 ACP.
