What I do:
I use piloted bore reamers to expand the action screw holes for the pillars. I drop about 20thou thickness of bedding tape on the barrel and the front, sides, and bottom of the recoil lug to be sure they don't have any contact once everything is cured and the tape removed. I fill all of the action holes and hollows with modeling clay to prevent the bedding compound from locking the action into the stock (pin holes, mag cut, chamber vent, etc). I use a 5 thousandth shim between the pillar and the action to ensure the pillar doesn't touch the action once bedded, then wrap short screws in tape to roughly center the screws in the pillars, and I cut grooves around the pillars to give the epoxy a better grip, also scratching the inside of the bore in the stock for the same reason. I rub down the action, shim, and screw with release agent, put ample epoxy on the pillars and some in the stock bore holes about half way down, through the end, and then slip the pillars into the stock, securing the action with electrical tape. Once cured, I relieve some of the wood in specific areas to give sufficient thickness of bedding compound, then bed the entire action using the makeshift stockmakers screws to pull the action down into the bedding. Then I flip it over and bed the bottom metal into the bottom of the stock as well.
I finish up with a mag base dial indicator to ensure it bedded down as it should.
