OP - they "don't eject" - a story.
An acquaintance brought over a 17 HMR rifle - could not get factory ammo to go into chamber. He said he had inserted some sort of tool in there to scrap out something - in my bore scope, I could see "ruts" along the chamber walls, and then metal from the ruts that was thrown up from the ruts - so that was what was stopping the cartridge to enter the chamber.
I bought a set of A-Zoom "Action Proving Dummy Rounds". They would not go into the chamber either. So I made a tool on my lathe, used it, and then multiple polishing with steel wool and could now get the action proving dummy to enter and the bolt would close. I took that rifle out to shooting place - unfired Winchester Super-X ammo would chamber and extract repeatedly - but when I fired one, that one not coming out - had to tap out with cleaning rod down from the muzzle - is obvious scrape marks in two places on that fired brass casing - so tells me that the fired case must have swollen a bit when fired, and that I do not have that chamber smooth enough.
However, the A-Zoom Action Proving Dummy Rounds still chamber and extract as expected. So does unfired factory Winchester Super-X ammo. But the fired one did not extract. So, also suggests to me that the Action Proving Dummy is not telling me much about whether I can get a fired casing out of chamber. Not sure what they thought it's purpose was - what I saw said it proves that the thing will feed and chamber, and will extract if unfired. Does NOT prove whether you can extract a fired round, though.
