Well. I think it has to do more with a lack of shooting.. For years. I have not had to shoot regularly.. Just a couple of rounds at the beginning of the year to make sure the gun was still on.. For 20 years I never had to adjust the site on my 243. Which was my only rifle.. This year I have acquired 4 new rifles and have been doing a lot more shooting.. None of them shooting great groupings, but I am more concerned about the 7-08 because it will be my primary rifle..