Rifle in question is recently built on an unused early 1950's commercial FN action. The internet is full of cautions of "Don't go through the thin surface hardening or your'll ruin the bolt." Realistically, how much is too much? Would working by hand with oiled 600 grit paper be too much? Working the surfaces against each other with 800 grit compound? Seems you would really need to go to town on it before you "ruin" it?
