I didn't suggest the action screws or the scope mount screws or the scope screws because I figured that your gunsmith (Whom I assume is competent) has probably already torqued, leveled, mounted and fitted all these things. You may have him check your action and true the bolt if that's not done yet. But I think its just that the rifle may not like the accubonds and may not like the bullet weight or the type of powder you're using. I know one of my .300 Win Mags opens groups just with changes in brass manufacturers when using new brass. Not so much with fireformed brass, though.