It's standard pressure 9x19 with a rimmed case. I've only seen one gun chambered in it, a Charter Arms. The gun was for sale with 1/2 a box of FMJ. I'd go out on a limb and say it's probably hard to get 9MM Fed. than it is .356 TSW.Adam5 said:Is anyone here familiar with the 9mm Federal caliber? I sit just another name for std 9mm? I'm looking at 9mm wheel guns and see some Charter Arms "Pit Bull" models that are chambered in 9mm Feredal.