For range ammo there's been a bit of a variety. Mainly 180 grain FMJ with some occasional 165 grain FMJ. Recently due to availability and price, it's been 180 grain Federal Champion from Walmart.
BTW, for long distance practice or precision shooting, the simgle most accurate ammo I've found is the Speer Lawman FMJ or TMJ. It's extremely consistent in velocity which for an ammo that will shoot very tight groups. While it is a bit spendy, if you want to try your hand at 50 yards or more, it's what I choose.
As for carry ammo, I have multiple 40 caliber handguns and have tailored my choice based on barrel length. For my P239 it's the 165 grain Speer Gold Dot. For the longer barreled guns it's the 180 grain Winchester Ranger T. As for my thinking, it's pretty simple, out of a short barrel a lighter bullet should achieve enough velocity to assure expansion.