Just reviewing LaOtto222's very comprehensive how-to on forend pillar bedding in the FAQs.
Considering going to dedicated forends for my three-barrel switch setup in 223/30-30/30-06 as the forend fit slightly different between the three. Most of the contact in the retention screw hole is at the back of the barrel lug - toward the receiver, which creates pressure toward the hinge. All three wear o-rings. Dedicated forends and pillar bedding may reduce a bunch of variation.
However, the instructions state there is usually some fit issues after pillar bedding when going back onto the frame. It makes sense as the centerline of the retention screw, once bedded with this method is likely to be closer to dead-on center than the original counter-sunk hole.
Can this be mitigated by allowing the epoxy to harden with the barrel in place on the frame? Or would this likely create an opposite situation, where things would go sloppy after bedding and then require shims between the spacer & forend?