There are some good epoxies out there.
Over the years I have used Devcon, Armorgrout and mining industry products. The armorgrout is very resistant to cleaning solvents etc.
One of the main issues with bedding an action is the preparation.
I have pillar bedded 2 rifles before using Acraglass Gel and stainless steel spacers. It is not a difficult process as long as u use plenty of release agent which comes with the kit and prepare the action well. U also get 2 different dyes with it to make it blend in with your stock or less conspicuous. It is easily shaped after it has cured and comes out easily if u put the whole barreled action in the fridge tho shrink down...a good wrap on the barrel and it comes out beautifully.
The good thing is u can use vinegar and a cotton tip to clean up any spills or unwanted epoxy (thats a good tip for anyone using epoxys to get ot off unwanted areas like your hands). I have not had any experience with the metal aggregates like Davcon though but I have seen good results done by others though.