What Happened Here? .308 case ribbed
 

Anyone care to guess what happened to these, .308 Federal Case. They were picked up at the range and feel as if they were fire formed to a chamber with rifling's cut in. They were also very sooty all over as you can see in the rim and neck area. They were nearly completely black from soot.

Anyway would like your thoughts!

RE: What Happened Here? .308 case ribbed
 

HK 91, they have fluted chambers. It's not rifling. It is used to increase reliability with the HK's roller locked blowback action. Makes the brass look weird, but isn't anything unusual.

RE: What Happened Here? .308 case ribbed
 

Interesting!

RE: What Happened Here? .308 case ribbed
 

Interesting, Wierd, but interesting. Hmmm I guess you do learn something new every day.

RE: What Happened Here? .308 case ribbed
 

CSI - Hunting.net

Tom

RE: What Happened Here? .308 case ribbed
 

They were fired in a fluted chamber. There are military weapons that have chambers fluted that way to aid in extraction of the fired cases. I had a Russian SVT40 Tokarev once that had the neck of the chamber cut like that. Ruined cases after several reloadings.....