May be some more experienced guys can explain this to me - after the last shoot and rain in Alberton, I took my action together with the scope out of the stock in order to dry it. I put it back on and then my POI at 30m (zero range) shifted about 40mm up. Why is that? I didn't touch the scope at all. Adrian also had the same change of zero with his rifle. He was explaining the zero shift is due to different tightening of the stock screws to the action. Is that the only reason for such change?
Also, if my screws get loose while shooting and I re-tighten them again, is my zero going to change again?