I've run a few boxes of the CCI S&W 40 through my pistol, never a prob and they're about the least expensive I've ever used. They ususally stock ten or twelve boxes at our local walmart, but in northern missouri, you can buy ammo at several of our c-stores and what not... The thing that cracks me up are the "little-shooters section" at the local gun shop.. The tiny bright pink and blue bolt-action rifles... so cute! lol