The contour/chatter post, excellent responses and I'd like to ask further questions. Over the years, I've had a couple guys request that I turn the steps off Mauser barrels, which I did, following best practices with light cuts and modest tailstock pressure and a well adjusted steady rest. I don't think I bent any barrels from poor practices, yet both guys kind of gave me the stinkeye when they shot the new profile and told me they had lost some accuracy. One of the guys is a master reloader and well understands that he would need to deal with a different barrel harmonic after turning and both guys adjusted bedding.
So, my long winded question, is this something that happens frequently when re-profiling? In both cases they were Mauser original barrels, and I don't know if these originals were heavily stressed in manufacture, or if I did something wrong or 'tis the nature of the beast. Thank you for sharing your experiences, Paul