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I put a digital manometer on my FX imact and noticed it was fluctuating a little bit. Is that normal? Between shots it does not settle to an exact pressure in all I would say there is a 3-5bar difference between an empty tank and full and between shots about 2-3bar. 

I have a fx impact that will not hold a Zero. My first 5 shots are a 2" group from the shots I made the night before. After those first 5 it will settle down and shoot a 1/4" group at 50yds but not the same zero that I left it at the day before. I know with my high caliber rifles I need to be...