Purchased a Tuxing TXEDM042 in September, and with the addition of a fluid filled gauge and a better pressure relief valve this is a real work horse, we shoot over 2000 rounds a month and fill bottles nearly every day. My rifles have 580 cc bottles that hold 300 bar. A 6.8 liter tank with 4500 psi in will only fill to 300 bar once or twice. Is there anybody out there pushing the Tuxing's to a little higher pressure?