Unusual malfunction .30 Luger case - Page 2

lugerholsterrepair · 02-06-2018, 05:24 PM

If the neck WAS too long it would extend beyond the chamber headspace and as the cartridge is fired the cartridge mouth would be pressed into the actual barrel..pinning it in place. Could make it difficult to extract.

mrerick · 02-06-2018, 05:45 PM

A bottleneck cartridge should headspace on the shoulder. The SAAMI spec I pointed to earlier shows this measured to the middle of the bottleneck shoulder.

It might be that someone took a 9mm reamer to the normally tapered chamber of a .30 Luger chamber... The chamber should be .3918 inches where the thick web of the case ends and .3805 at the start of the shoulder.

I'm only speculating without a cast of the chamber or good photos.

DonVoigt · 02-06-2018, 08:06 PM

Could be most anything, including a simple defective case.

Wilhelm · 02-07-2018, 12:20 PM

Quote:

Originally Posted by DonVoigt

I would say it was simply a defective case.
Defect in the drawing of the case that escaped any inspection; I would expect it happens every "x" thousands of cases that are made.

Nothing to do with the luger or the shooter; just bad luck!

100% agree. No need to overthink it.

lugerholsterrepair · 02-07-2018, 01:47 PM

Nothing wrong with thinking it either. I have lost track but I don't believe we have ever been able to see the base of this cartridge. That would be a helpful clue to determine if over pressure was a factor.
A careful analysis of a problem like this seems prudent to me.

ithacaartist · 02-07-2018, 02:05 PM

Quote:

Originally Posted by lugerholsterrepair

Nothing wrong with thinking it either. I have lost track but I don't believe we have ever been able to see the base of this cartridge. That would be a helpful clue to determine if over pressure was a factor.
A careful analysis of a problem like this seems prudent to me.

http://forum.lugerforum.com/showpost...5&postcount=13

Or do we need to also see the head of the case?

DonVoigt · 02-07-2018, 02:34 PM

Maybe it helps to go back and read the original post,
two rounds fired ok, then switch of ammo and the separated case was discovered.

Perhaps 4scale will come back an add a little more to answer some of the questions posed;
like is it really a .30 luger? Does it shoot ok with Privi ammo?

lugerholsterrepair · 02-07-2018, 03:05 PM

OK,,very confusing thread..4 scale is the original poster with a sheared case..then ttarp shows a case with the base present in post #13 THIS case looks like it fired out of battery. Or at least with the case partially out of the chamber?
4 scale says he was unable to find the base of his sheared cartridge?

4 Scale · 02-07-2018, 03:06 PM

Yes Jerry it is bit of a confusing thread with two separate collectors showing a similar malfunction.

I've long since disposed of the sheared case so I'm unable to examine the shoulder. The shoulder of the sheared round does look long in the photo in post #1. As I recall it did take a good shove to drive the sheared case out of the chamber, so I'm wondering if maybe Jerry is right in his post #21 that the long neck is the culprit.

The pistol used to fire the sheared round shown in post #1 of the thread was a Portuguese 1906 with the royal crest scrubbed off. It has performed flawlessly with perhaps 100 rounds of .30 Luger Prvi Partizan ammo since the sheared case. I have verified the pistol is chambered for .30 Luger (a 9mm Luger dummy round will not chamber). After considering all comments I believe it was just the one defective round. But, next range trip I'll save some ejected cases and compare to unfired ammo to see if something is going on.

ttarp · 02-07-2018, 03:30 PM

I'm sorry for the confusion, I should have started a new thread.

At any rate, after a good cleaning, went back to the range and fired about half a box of PPU, and then went on to finish up the box Fiocchi without issue.

Thanks for everyone's help, and I'm sorry again for the confusion.

02-06-2018, 05:45 PM	#22
mrerick Super Moderator - Patron LugerForum Life Patron Join Date: Dec 2009 Location: Eastern North Carolina, USA Posts: 3,909 Thanks: 1,374 Thanked 3,110 Times in 1,510 Posts	A bottleneck cartridge should headspace on the shoulder. The SAAMI spec I pointed to earlier shows this measured to the middle of the bottleneck shoulder. It might be that someone took a 9mm reamer to the normally tapered chamber of a .30 Luger chamber... The chamber should be .3918 inches where the thick web of the case ends and .3805 at the start of the shoulder. I'm only speculating without a cast of the chamber or good photos. __________________ Igitur si vis pacem, para bellum - - Therefore if you want peace, prepare for war.

02-06-2018, 08:06 PM	#23
DonVoigt User Join Date: Apr 2015 Location: near Charlotte NC Posts: 4,681 Thanks: 1,441 Thanked 4,350 Times in 2,040 Posts	Could be most anything, including a simple defective case. __________________ 03man(Don Voigt); Luger student and collector. Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie

02-07-2018, 01:47 PM	#25
lugerholsterrepair Moderator Lifetime Forum Patron Join Date: Jun 2002 Location: Arizona/Colorado Posts: 7,772 Thanks: 4,933 Thanked 3,124 Times in 1,434 Posts	Nothing wrong with thinking it either. I have lost track but I don't believe we have ever been able to see the base of this cartridge. That would be a helpful clue to determine if over pressure was a factor. A careful analysis of a problem like this seems prudent to me. __________________ Jerry Burney 11491 S. Guadalupe Drive Yuma AZ 85367-6182 lugerholsterrepair@earthlink.net 928 342-7583 (CO & AZ) Year Round 719 207-3331 (cell) "For those who Fight For It, Life has a flavor the protected will never know."

02-07-2018, 02:34 PM	#27
DonVoigt User Join Date: Apr 2015 Location: near Charlotte NC Posts: 4,681 Thanks: 1,441 Thanked 4,350 Times in 2,040 Posts	Maybe it helps to go back and read the original post, two rounds fired ok, then switch of ammo and the separated case was discovered. Perhaps 4scale will come back an add a little more to answer some of the questions posed; like is it really a .30 luger? Does it shoot ok with Privi ammo? __________________ 03man(Don Voigt); Luger student and collector. Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie

02-07-2018, 03:05 PM	#28
lugerholsterrepair Moderator Lifetime Forum Patron Join Date: Jun 2002 Location: Arizona/Colorado Posts: 7,772 Thanks: 4,933 Thanked 3,124 Times in 1,434 Posts	OK,,very confusing thread..4 scale is the original poster with a sheared case..then ttarp shows a case with the base present in post #13 THIS case looks like it fired out of battery. Or at least with the case partially out of the chamber? 4 scale says he was unable to find the base of his sheared cartridge? __________________ Jerry Burney 11491 S. Guadalupe Drive Yuma AZ 85367-6182 lugerholsterrepair@earthlink.net 928 342-7583 (CO & AZ) Year Round 719 207-3331 (cell) "For those who Fight For It, Life has a flavor the protected will never know."

02-06-2018, 05:24 PM	#21
lugerholsterrepair Moderator Lifetime Forum Patron Join Date: Jun 2002 Location: Arizona/Colorado Posts: 7,772 Thanks: 4,933 Thanked 3,124 Times in 1,434 Posts	If the neck WAS too long it would extend beyond the chamber headspace and as the cartridge is fired the cartridge mouth would be pressed into the actual barrel..pinning it in place. Could make it difficult to extract. __________________ Jerry Burney 11491 S. Guadalupe Drive Yuma AZ 85367-6182 lugerholsterrepair@earthlink.net 928 342-7583 (CO & AZ) Year Round 719 207-3331 (cell) "For those who Fight For It, Life has a flavor the protected will never know."

02-07-2018, 03:06 PM	#29
4 Scale User Join Date: Nov 2014 Posts: 544 Thanks: 194 Thanked 489 Times in 251 Posts	Yes Jerry it is bit of a confusing thread with two separate collectors showing a similar malfunction. I've long since disposed of the sheared case so I'm unable to examine the shoulder. The shoulder of the sheared round does look long in the photo in post #1. As I recall it did take a good shove to drive the sheared case out of the chamber, so I'm wondering if maybe Jerry is right in his post #21 that the long neck is the culprit. The pistol used to fire the sheared round shown in post #1 of the thread was a Portuguese 1906 with the royal crest scrubbed off. It has performed flawlessly with perhaps 100 rounds of .30 Luger Prvi Partizan ammo since the sheared case. I have verified the pistol is chambered for .30 Luger (a 9mm Luger dummy round will not chamber). After considering all comments I believe it was just the one defective round. But, next range trip I'll save some ejected cases and compare to unfired ammo to see if something is going on.

02-07-2018, 03:30 PM	#30
ttarp User Join Date: Aug 2017 Location: S.E. Texas Posts: 24 Thanks: 11 Thanked 15 Times in 10 Posts	I'm sorry for the confusion, I should have started a new thread. At any rate, after a good cleaning, went back to the range and fired about half a box of PPU, and then went on to finish up the box Fiocchi without issue. Thanks for everyone's help, and I'm sorry again for the confusion.