The remaining question this inspires to me wonder is: "does that finish affect anything (to practical effect")? I would presume "yes" if one were chasing the finest causes of variation, otherwise it's a "no" to most users. Thanks for posting.
As bad as the bore scope makes the shoulder area finish appear, the shoulders on the fired cases look fine. Which was one of the reasons I leaned on the test fire rounds pretty hard...to make sure the case shoulder area blew out hard against the chamber.
I might still give the shoulder area a little touch up. 🤔 But sometimes, the enemy of 'good' is 'better'.
Good shootin' -Al
