I don't know if it's measurable or not. That rifle is long gone at least 15 years ago. Would all rifles not have impaired / changed barrel bluing simply by shooting given that all barrels stretch and snap back into shape as a bullet passes through? Presumably if the barrel has exceeded its elasticity such that barrel metal is displaced, it should be measurable given the right measuring tools.... A thou, 10 thou, 100 thou?

I have newer high lustre blued rifles that have fired many more rounds than that long ago Weatherby that look like they just came out of the factory....... No funky twizzler twists in the blue..... Indeed, no evidence whatsoever externally that they've ever been fired........

I too have a bunch of X bullets, but they will NEVER pass through the bore of any rifle of mine. TSX, sure. Love 'em. Original Barnes X are paper weights to me.