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IMO, I doubt that soft steel or overheating/annealing have anything at all to do with OSR. If lack of barrel hardness is a contributor, degradation of the rifling inside the barrel would become apparent long before OSR. I would think that for OSR to occur, the lands would have to actually be harder than the rest of the barrel steel. I will have to re-read this entire thread, but is it right that OSR is visable but not measurable?
"but is it right that OSR is visable but not measurable?"
That is my understanding of it.
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