"RMORRIS"Yes, I have experienced this. First in my Impact, first couple shots were always low. The Impact was great to hunt with but I could never get tight groups with it. I traded it in for a .30 Crown. When the Crown arrived the regulator gauge read 165 bar. I shot it a couple times and it came down to around 150 and was shooting 44.75''s @ 870 fps. This gun shoots way better than the Impact. I was in love for the fist two weeks. Then during a disappointing day shooting targets at 100 yards I realized while filling that the regulator was creeping up to 185 bar... so the first couple shots were always low; 745-800 fps. My regulator has settled in at 175 and drops to about 160, after a few shots. I might add that my brother has the same gun from the same batch and his regular pressure stays at 150 all the time. So naturally I think my Crown is defective. I call FX service center today-they're closed. Oh well. So I read the manual, removed the bottle, set hammer spring to minimum, fired a couple shots til regulator dumped, screwed regulator adjuster clockwise 1 turn, screwed bottle back on, backed out regulator (counter clockwise ) til gauge read 148, ten shots at around 870 fps so far so good. Then I filled to 230 bar that was 2 hours ago and regulator is holding steady at 150 bar. I hope this fixes it. You might want to try this with yours. Good luck.