back to the first post. My old classic mag would run around 325-400, when it got much above 400 PSi it started to kick and sounded more like a .22. I even started getting echos from the woods next to my house. I remember one of the AGD techs or tom Kaye having a comment on line that with the bolt moving forward and creating more space for the air to expand into the pressure that actually reaches and touches the ball got down to around 80PSI. I probably wouldn't sit and correct the store worker either but then again I like to make people feel stupid once in a while.