I had my gun perfectly sighted in last year, I would shoot 1.25" high and put each round into a group of .33" at 100 yds. I went to the shooting range the day before yesterday and I could not even hold a 3-5" group for the life of me shooting off of secure sandbags. Today I stripped my rifle from it's HS Precision stock and saw a build up of what looked like rust and hard water stains and build up behind the recoil lug spanning the area of where my action meets the aluminum block screw would be placed, upon further inspection I also saw the same buildup of gunk/rust where the safety area underneath the action meets the aluminum block and screw. I lightly sanded, cleaned and oiled both areas along with the aluminum block of the HS stock. Now that all of the gunk and rust are gone is it safe to say that this is where my inaccuracy could have stemmed from?