Very informative Austin- I have wondered about that as well. How do you set a compund lathe to turn the final contour on somewhat dis-similar ferrous alloyed metals, dis-similar as to free machining characteristics? I also recall the story about the visitor and the oil spray from the barrel boring operation, believe I read about it in my copy of the Peter Johnson book.
Very interesting the data about the need to produce both 40 V grade and later 40 Trojan grade barrels to meet production- I am curious, would that mean 40 individual tubes, or does that mean 40 barrel sets?
