It would be good to know if there is a "standard" for chamber wall smoothness (either measurable like "no scratch/low spot greater than .0005", or subjective such as "not visible under 5x magnification").
My scratches are much less than the thickness of a Lapua brass case wall - probably one tenth of that.
I'd also like to understand better the correlation between these kinds of chamber surface imperfections and accuracy. Do they matter at all?
I'm guessing no - but the next question is "what about feeding/extraction reliability"?