[Scorch]

IN THEORY Remington 700 actions (receiver and bolt) and barrels are made to close tolerances and the receiver and barrel threads are indexed so that the barrel will screw in and headspace properly. Remington typically does not ream chambers, their barrels are hammer-forged, and come off the mandrel complete with chamber. Tolerances for chambers is typically .008"-.010", and Remington barrels usually fall within those specs. BUT I will agree with Jim Keenan that you should let an experienced gunsmith do a rebarrel, it is NOT a DIY project. You need a barrel vise, an action wrench (with lug guide), reamer, lube, and headspace gauges. You will need to completely disassemble the bolt (including ejector) in order to properly check headspace. Twisting the old barrel off and screwing a new one in may lead to health problems.