You really only have a couple of options. If I were bedding a Mark V I'd strongly consider using guide screws and surgical tubing to bed it, but that's just me. You could, in theory, use a guide screw, remove it after action insertion, clean out any compound with a q-tip, and then torque down a thoroughly release-agent coated action screw. But I'm kind of with Ernie the Gunsmith on using action screws to torque down the action during bedding. It will introduce any imperfections in the stock to the bedding job by torquing the action into them.