On my Bridgeport mill. Don't have a mill? Then a rotary file on a die grinder or a Dremel type tool. Make a bunch of shallow cuts really close to one another, and then use a dowel slightly smaller around as your action with 60 grit paper wrapped around it to remove just a thin layer of the old bedding. Be prepared to do a little body work on the stock in places where the rotary file gets away from you, and tang area where the paper might scratch the stock a little. A new paint job might be needed after rifle is bedded again.