Mike, when you pillar bed a rifle (say a remington 700 action) you drill out the two screw holes to 5/8" Dia. in the stock and glue in aluminum "pillars". The top of the pillars are machined to match the contour of the action. The trigger gaurd rest on the pillars on the bottom side. This allows you to torque the action bolts, and because your not compressing wood or fiberglass they retain the torque. Your providing even contact between the action and the pillars so the action isn't being bent or twisted by the stock. Some people space the action .010" above the stock inside the bed on the pillars to isolate the action from the stock. When you bed the stock, you use some type of epoxy puddy that you place at the rear of the action at the screw mounting area, and at the front mounting point (recoil lug) using tape on the front and sides & bottom of the recoil lug to give you clearance. You only want contact with the rear of the lug. All this bedding work should stabalize the action so it's not being bent when you tighten the mounting screws, and the action isn't shifting around in the stock from shot to shot.