Hi No I did not chrono the rifle it is very consistent over chrono well within 10 fps generally. Target was paper same one I zeroed at 25 yards. The shift came at the end of the session. So rifle warmed up so to speak. Yes a cold morning but temp probably did not rise that much. I.e. all of a sudden did not rise to 10 degrees for example. If mount bedding in there would be screw movement. All where tight.