Speer Gold Dot 40 S&W 180 GR Hollow Point Short Barrel
My carry gun is usually a Glock 27. I think any 40 S&W will do the job, but Speer is carrier by a lot of law enforcement. I do not know if the short barrel version actually works better, but that is my current choice. It is not always easy to find, so I would go with the 180 GR HP carried by many police. Some other cartridge may be better, but I prefer to go with a known.
I know the flash can really mess up night vision and the short barrel tries to lessen the flash. Maybe it helps and maybe not. I do not get to do night fire where I now live. The last time I remember doing night fire was with a machine (M60) and I might as well have kept my eyes closed after the first burst. My spotter was all that kept me near the target. I could not even see the tracers.
Anyway, my guesstimate is that I should consider loosing night vision and that the 40 S&W round will over penetrate. That is why I went with the Speer Gold Dot 40S&W 180 Grain Short Barrel ammo (SPEER 23974 GLDDOT 40SW 180GDHPSB).