Reply To: Regulator drop??
Since you say the “gun was filled way past 250b”, it could be a possibility that the gauge is no longer accurate. The gauge may have been way over, but you actually only have 250b in the gun. Do you have a reliable gauge on your fill assembly?
If so then you need to leave it hooked up (with your air source off) and watch all 3 gauges as you shoot over a chrony. Just fill the gun with a little more air then it takes to get the regulator gauge up to where it stops at it’s max point. Then shoot down recording the fps of each shot and the reading on each of the gauges after the shot.
With this you should be able to tell if you have a gauge problem (likely) or if you have a regulator problem.