I tap the scope with every adjustment I checked all screws waited for the barrel to cool between shots I shoot from a lead sled I don’t cough burp jerk of fart I been doing this for a many years it may be what Dennis mentioned it’s a wood furniture stock I have always had problems with this gun last year I had it good to go 2”s high at a 100 yards went hunting and spine shot a buck at 125 yds then heart shot a doe later at 30 yds every year it takes a almost a box of ammo to get it close I’m going to pick up a different rifle todayTap your scope with a shell or mag (lightly). Do that then shoot and see if it moved. Adjust and tap the scope then fire.
It may be sticking on the adjustment and when you fire it move it. IMO