Rifling marks on a 223 neck HELP!

[Walkalong]

Trim it to 1.750 and shoot it.

 

[Kernel]

Looks like factory crimp marks to me. I have a lot of Winchester .30-30 brass that looks exactly like that (gotta admit I've never noticed it on any .233, though, milsurp or otherwise). Those marks never go away no matter how many times the cases are sized, trimmed, & re-crimped. Heck, even my 7-30 Waters brass formed from .30-30 cases has those marks.

 

[Borg]

Left over factory crimp! LOL
Borg

 

[243winxb]

leave it and shoot it, trim to 1.750 after FLRSing

 

[JonB]

Besides, with rifling, the skinny parts would be deeper, not the wide parts.

That's what I was thinking too, but wasn't sure if there were different types of rifling that would match that pattern.