Haha u have no idea how hard it was not to shoot one of them from the deadbox just to save some time/ a draw from a gun battle taking them both out (which happened).
I chronod high but that was because I just filled my bottle, the air coming out the compressor was warm that day.
Chances are it's the battery in the chrono running low or your high pressure regs need a good cleaning (I've managed to chrony at 420 with an old school trix @ Campaign due to a creeping front reg., scared the hell out of the chrono marshall)
Only just saw this, i was the reff doing the chronoing when your guns were hot, the gun in question organnally chroed at 310+ or somthing like that u then turned the vlocity up instead of down thous making go to 400