Are you cleaning the bore between shooting sessions? And/ or removing either part of the stock when cleaning the rifle? I have a 99F in .308 that will group 3/4 to 1and1/4 when fouled, but will shift point of impact 4 to 6 inches with after cleaning. Have to leave it dirty if hunting with it. Visible pitting in the bore. Seriously considering getting it rebored to .358.
