What's up with these cases?

Dr. Strangelove · December 14, 2008, 05:49 PM

Being the incorrigible range brass scrounger that I am, I picked up a few 9mm the other day that looked like this:

Even after tumbling overnight. Also, the case mouths look crenelated, is that a product of being driven into the rifling or something else? They are all Winchester cases.

F. Guffey · December 14, 2008, 06:02 PM

Dr. Strangelove, looks like someone got a little carried away with a Lee factory crimp die.

F. Guffey

wjkuleck · December 14, 2008, 06:13 PM

They're from a fluted chamber, e.g., H&K. Possibly a the H&K subgun. Since the roller "lock" is really a "hesitation" lock, the chamber is fluted so as to prevent complete obturation. Thus, the case extraction is aided by the "lubrication" provided by the combustion gases making their way down the sides of the case.

Your CETME and H&K rifles will demonstrate the same phenomenon.

Regards,

Walt
PS I misremember whether the H&K P7 has a fluted chamber...

rn22723 · December 14, 2008, 06:16 PM

HK fluted chamber fired brass!

rn22723 · December 14, 2008, 06:17 PM

HK fluted chamber fired brass! From a HK long gun not a hand gun.

Dr. Strangelove · December 14, 2008, 06:52 PM

These little guys are headed for the poor side of town, as the next chamber they see will be my Ruger P89, not some fancy H&K!

Gewehr98 · December 15, 2008, 01:16 AM

They'll look like hell, but resize just fine for reloading. After enough tumblings and resizings, they'll look almost normal, save for the faint longitudinal stripes that the HK fluted chambers permanently add.

veeref · December 16, 2008, 10:42 AM

+1 to what the above posters said, most probably out of an HK fluted chamber. I have an HK UMP conversion and the brass looks exactly like that, even after cleaning.

December 14, 2008, 05:49 PM	#1
Dr. Strangelove Senior Member Join Date: August 1, 2008 Location: Athens, GA Posts: 1,406	What's up with these cases? Being the incorrigible range brass scrounger that I am, I picked up a few 9mm the other day that looked like this: Even after tumbling overnight. Also, the case mouths look crenelated, is that a product of being driven into the rifling or something else? They are all Winchester cases.

December 14, 2008, 06:13 PM	#3
wjkuleck Senior Member Join Date: March 13, 2007 Location: Ohio, USA Posts: 1,219	They're from a fluted chamber, e.g., H&K. Possibly a the H&K subgun. Since the roller "lock" is really a "hesitation" lock, the chamber is fluted so as to prevent complete obturation. Thus, the case extraction is aided by the "lubrication" provided by the combustion gases making their way down the sides of the case. Your CETME and H&K rifles will demonstrate the same phenomenon. Regards, Walt PS I misremember whether the H&K P7 has a fluted chamber... __________________ Author, NEW! The M1911 Complete Owner's Guide The M14 and M1 Garand Complete Assembly Guides The M1 Garand Complete Assembly Guide The AR-15 Complete Assembly and (New 4th Edition) Owner's Guides

December 14, 2008, 06:52 PM	#6
Dr. Strangelove Senior Member Join Date: August 1, 2008 Location: Athens, GA Posts: 1,406	Thanks! These little guys are headed for the poor side of town, as the next chamber they see will be my Ruger P89, not some fancy H&K!

December 15, 2008, 01:16 AM	#7
Gewehr98 Senior Member Join Date: July 1, 2000 Location: Token Creek, WI Posts: 4,068	Shouldn't be a problem. They'll look like hell, but resize just fine for reloading. After enough tumblings and resizings, they'll look almost normal, save for the faint longitudinal stripes that the HK fluted chambers permanently add. __________________ "Bother", said Pooh, as he chambered another round... Neural Misfires

December 14, 2008, 06:02 PM	#2
F. Guffey Senior Member Join Date: July 18, 2008 Posts: 1,622	Dr. Strangelove, looks like someone got a little carried away with a Lee factory crimp die. F. Guffey

December 14, 2008, 06:16 PM	#4
rn22723 Junior member Join Date: December 10, 2001 Location: Burbs of Minneapolis Posts: 676	HK fluted chamber fired brass!

December 14, 2008, 06:17 PM	#5
rn22723 Junior member Join Date: December 10, 2001 Location: Burbs of Minneapolis Posts: 676	HK fluted chamber fired brass! From a HK long gun not a hand gun.

December 16, 2008, 10:42 AM	#8
veeref Member Join Date: October 4, 2006 Posts: 41	+1 to what the above posters said, most probably out of an HK fluted chamber. I have an HK UMP conversion and the brass looks exactly like that, even after cleaning.