I am far from an expert, but aren’t modern 2019-style hard chroming processes improved over past ones?
https://criterionbarrels.com/media/chrome-lined-vs-salt-bath-nitrided-barrels/
Criterion says their chrome lined barrels can get .5 moa with hand loads.
That is one company I had in mind when I posted that!
Maybe that’s because you’re buying $100 “Mil-Spec” barrels.
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That and the fact that Cut Rifle barrels receive hand lapping by their makers to the point that they will not strip copper off of the bullet to the degree that a lot of mass produced “mil-spec” barrels will.
Barrels are the sum totality of the amount of work put into them.