My Tau 7 is set to 460 fps and returns 90 - 100 shots from a 12g CO2 cartridge. The last 5 shots fall off very quickly and its obvious from the sound that the gas is running out. Its a great pity that this pistol is no longer made - it really is worthwhile trying to find one. I managed to get spare valve parts from Potter Firearms in Australia - could not find any elsewhere.