I have had one experience with a wooden stock that changed point of impact dramatically due to humidity.The rifle was an almost new 700 bdl in 25-06,and the point of impact changed nearly 6" at 100 yards when exposed to rain and wet snow for a few days after being stored indoors in very low humidity.The point of impact went from 3" high at 100 yards,to almost 9" high at 100 yards,then back to 3" high at 100 yards after drying out for a week.I have seen changes in impact in other wooden stocked rifles as well,but they were all within an inch or two at 100 yards.