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I too have PERSONALLY experienced OSR on my rifle..., A brand spanking new Weatherby MK V in .378. The culprit? Barnes X. The Hornady Interlocks shot fine and I got it sighted in with them. Back home for a cleaning. Barrel wiped and polished with a soft oily cloth, nice and shiny beautiful deep blueing removing the unsightly finger prints from the surface.

Then to the range with a fist full of 300 grain Barnes X..... back home for another cleaning and voila! Lovely spirals matching the rifling clearly visible in the blueing on the entire outside length of the barrel starting from just ahead of the chamber. I wish they had come up with the stress relief grooved bore rider design BEFORE I pooched a beautiful rifle with this original Barnes X. I would still own that rifle had it not been destroyed like that.

Believe it or not.

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Did you take any measurements of the barrel exterior to see if there was any variation between what would be the grooves and pressed-out lands and or internal slugging to determine if any interior change occurred?

Seems like these questions have been asked before w/ non-committal responses. I just can't remember. If there aren't any dimensional differences, might one conjure variable heat stress showing in color of steel? But how many would have to have been shot in what time to generate something of that sort? Who knows.

But certainly the latter, as I've mentioned in the past, gives cause for pause thinking of all the billions of French solid brass 8mm Lebel bullets sent down range in everything from bolt guns to Hotchkiss machine guns as well as some of the early steel-core HARD AP military rounds that might have been shoved thru low-end tolerance mil barrels.

The mystery goes on!!

And on!!