Daryl brings up a point of which I am pondering. My thoughs are a recent 4140 barrel may not be suitable. But, if OSR showed up in a 4140 barrel, then we would be safe in assuming it would certainly be present in barrels made from older steels.

Anyone know of a source for barrel steel specs for the earlier doubles? Might the John Rigby Firm have an answer? I also wonder if the John Rigby Firm would have any interest in this project.

I always wanted to build a cut rifling machine, even have some designs, they are not that difficult to make. Now might be the time. Then I would be able to select a steel closely matched to the older barrel steels.

For Tinker, what do you think, is the most important factor Modulus of Elasticity, Ultimate Tensile Strength, or Elastic Limit?

Someone mentioned this subject was thrashed in the 1980's. Anyone have an article or a reference?