try filling to 180 bar and put 20-30 shots through it to get a rough idea of power, one thing for sure I cant see it creeping up it doesnt matter how many shots you put through the barrel mine did the squeek when filling then sometimes wouldnt fill as the valve would stay stuck, so a few short blast would ease the valve to allow it to hold air, probably had some grime in it from the factory, same as the barrel.