I just exchanged a 10lb(might have been 8lb) CO2 bottle for a 20lb. I cant remember what the regulator said when I hooked it up but I want to think it was around 800PSI. I have only pushed maybe 30 pints from a fresh keg and the PSI gauge is reading at about 690 PSI right now. The serving PSI is set to 10PSI. The tank is sitting at about 70 degrees, does that PSI sound correct for a full 20lb tank at that temperature? I checked for leaks and didn't find any.