You do need to gently relieve the high area in order to get the receiver to sit correctly. There are several methods, but I use the talcum powder method previously described. Dust the entire rear of the forend, and oil the metal. Reassemble and screw up tight. Dissemble, and then check where the metal is leaving the strongest marks.
The flat base of the receiver around the front magazine screw ("King" screw) is often a shade too high when new wood is fitted. You have to use a sharp flat blade to gently scrape this area down so that it allows the receiver to transfer some of the bearing pressure to the underside of the barrel.
Note that the receiver may twist if it is pivoting - leading to the offset barrel - or this may be caused by one of the sidewalls being a bit high. Particularly check where the magazine cut-off boss and also the bolthead release catch fit - often these bear against the sidewall and are enough to push the barrel off-centre.
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