I'm afraid to say that I do not have any guns with an accustock. In general the idea is to eliminate stress (distorting forces) acting upon the receiver. With pillar only bedding the action is supported by pillars at the action screws, while glass bedding cradles the action over a broader area. In either case, contact in the tang area at the rear of the action can create stress when the action screws are tightened. Just be sure that there clearance under the tang. Accustock owners will be able help with action screw tightening sequence and torque values, which may also help tighten up your groups.