Lee-Enfields are well-known for shooting about five-six minutes high when they get wet. It was one of the reasons some people were glad to move on to other actions when they began to be allowed in the 1970s.
Some people tried to keep their ammo dry, some just accepted the rise and got everything thoroughly wet and hoped that nothing wouldn't crack in the action (7.62 conversions only). The NRA Coaching Course notes I have here mention it.