Detailed instructions and actual chambering on a gunsmith's lathe include the following:
Gordy Gritters is a Benchrest Gunsmith who specializes in building 1000 yard rifles. He has built several rifles that hold world records and have won National Championships. He is extremely meticulous and gives up many of his "secrets" on this video!
Until now, there has been no other chambering video that shows you so many techniques used by master gunsmiths!