Tikka T3 problems and looking for help. Got this in 2011 and it shot 1/2” MOA out of the box with Fed premium ammo (7 mm Mag). Sat in the safe for years and stock shrank, aluminum recoil lug got loose and group went to about 6”. Had the wooden stock bedded. Shrunk the group back to 2 3/4” (not acceptable). Bought a B&C stock (which did not fit) so opened it up, bedded it including a new steel recoil lug. Bedded it to the balance point (figured I can always open the barrel channel back further). 4” group (all at 100 yds.). It has not had 60 rounds through it. Logic tells me it should shoot 1/2” MOA again as it has not been out of the safe a dozen times since I owned it. Not shot a lot, beat up or carried hunting much. I see no point in working up a handload until it gets close to what is shot new. What am I missing?