FJR - the touching 1/4 rib is a good start. It cured my wild groups right off the bat. Aside from bedding the barrel onto the hanger, that's it for the .218Bee. The 7x57 needed only bedding as the 1/4 rib was already clear by .010".
It is a good idea to soak the 1/4 rib screws in penetrating oil for a few days before trying to remove them.