Greetings Again,
I think that you are right about the problem being roughness on the neck shoulder junction. I think I can see a little ridge of brass at the lower end of the mark and a bright spot on the case mouth at the start. Your local sports shop should be able to point you at someone who has the right dies to check, or local NZDA or shooting clubs. The wooden spoon might just crack it though. I'm a bit OCD on handloading and would be unable to rest until I found and corrected the problem either.
Regards Grandpamac.
PS. Try chamfering the inside of the case neck before sizing as well,
Bookmarks