I have been aware of this web how to article 6 or 7 years but I don't remember seeing it linked here. Thought I would post it for some of the fans of lapped necks in non bushing sizing dies. This is not my work and I take no credit of any sort. But I think this guy does a very good job of describing how to use barrel laps to open up a die neck.
He also used the same process to open non nitrided Wilson type bushings.
https://rickaverill.com/projects-past-and-present/lapping-reloading-dies/
He also used the same process to open non nitrided Wilson type bushings.
https://rickaverill.com/projects-past-and-present/lapping-reloading-dies/