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08-07-2017, 04:54 PM
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Banned
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Join Date: Nov 2009
Location: High River, AB
Posts: 10,788
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Even a .22 rimfire can cause injury.
The pictures are of a .22 rimfire old German made rifle single shot that was likely manufactured prior to WWI. The customer wants it to fire as it did not do so. First, I found that the firing pin was far too shot, thus I made a new one. I found that I had to push the bolt handle ahead towards the chamber for it to fire even with a new firing pin. Fine, I layed a bead of weld on the back face of the bolt handle and machined it down on the lathe to give an extra 0.010" thickness as that is what my dial indicator showed it to be missing. Once done, a longer firing pin, rebuilding the wear and tear from the bolt handle, it fires every shot. However, a major problem still exists. Look at the bulge on the spent case. I don't know if you can see it, but the head of the casing is also bulged an looks convex. Of course, it will fire, but it isn't safe to do so. The moral of my story here is that even a .22 rimfire can cause issues and be dangerous to fire. In this case, there was no blow back, but this fellow will be told that "yes" his gun will fire, but I certainly don't recommend it unless the issue is fixed. I already know the cause if this problem and can fix it, but I figured that I'd throw this out for you guys and see if you all come up with a diagnosis and solution. FYI, the firing pin strikes at the 12 0'clock position, the bulge is directly 180 degrees opposite at the 6 0'clock position. Go...
<a href="https://postimg.org/image/oyynudbyn/" target="_blank"><img src="https://s19.postimg.org/oyynudbyn/20170807_162555[1].jpg" alt="20170807_162555[1]"/></a>
Last edited by gitrdun; 08-07-2017 at 05:00 PM.
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08-07-2017, 05:41 PM
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Join Date: Jan 2012
Location: Western alberta
Posts: 1,164
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Looks Like the bolt is not supporting the rim. The firingpin is pushing the cartridge forward and the case head blows out cockeyed due to the clearance. The fix is putting more material on the bolt handle to satisfy the headspace issue or setting back the barrel. Do I win?
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08-07-2017, 05:47 PM
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Banned
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Join Date: Nov 2009
Location: High River, AB
Posts: 10,788
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No.
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08-07-2017, 05:52 PM
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Join Date: Jan 2012
Location: Western alberta
Posts: 1,164
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Quote:
Originally Posted by gitrdun
No.
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Fine then.
I know. Bolt face is not square to the chamber.
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08-07-2017, 07:07 PM
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Join Date: Nov 2009
Location: East Central Alberta
Posts: 8,315
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Saw the result of someone ...filed a bevel on the feed ramp to make it feed better (Cooey tube repeater)...blew the bottom out of the case near the rim...ignited the round coming up from the tube. Split the stock.
__________________
Old Guys Rule
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08-07-2017, 08:22 PM
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Join Date: Jan 2012
Location: Western alberta
Posts: 1,164
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Quote:
Originally Posted by 260 Rem
Saw the result of someone ...filed a bevel on the feed ramp to make it feed better (Cooey tube repeater)...blew the bottom out of the case near the rim...ignited the round coming up from the tube. Split the stock.
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He must of removed allot of material. Wow
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08-07-2017, 09:10 PM
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Join Date: May 2007
Location: WMU 214
Posts: 1,817
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Blown out
Looks like the round is not chambering completely and its firing out of battery.
Could be a build up of lead, etc ?
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08-07-2017, 09:35 PM
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Join Date: Apr 2010
Posts: 818
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The extractor is not supporting the case body when at peak pressure. The bulge that you pictured is where the case expands when it is fired, the brass flows outward onto the extractor surface. The JGA Anschutz and Zella Melis single shots along with countless others of Austrian pedigree with their draw back extractors are famous for this anomaly. You can possibly source a new extractor from the internet to cure this or build one up your self and hand fit to better support the cartridge in the chamber. Of course both options far out weigh the value of the firearm your trying to repair. Not like that's something new to a gunsmith. D.H.
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08-07-2017, 10:04 PM
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Join Date: Jun 2007
Posts: 191
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It's chambered in 22 long not 22 long rifle
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08-07-2017, 10:36 PM
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Join Date: Dec 2009
Posts: 447
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It's been shot out with 22 short corrosive
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08-07-2017, 11:00 PM
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Join Date: May 2007
Location: Central Alberta
Posts: 21,399
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Drill out, sleeve and rechamber ?
Grizz
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"Indeed, no human being has yet lived under conditions which, considering the prevailing climates of the past, can be regarded as normal."
John E. Pfeiffer The Emergence of Man
written in 1969
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08-08-2017, 01:31 AM
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Join Date: May 2010
Location: red deer
Posts: 3,379
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Cut up and discard. Then make trip to cabelas.
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08-08-2017, 08:50 AM
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Join Date: Jan 2012
Location: On the border in Lloydminster
Posts: 8,369
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Try firing shorts?
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Si vis pacem, para bellum
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08-08-2017, 09:14 AM
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Banned
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Join Date: Nov 2009
Location: High River, AB
Posts: 10,788
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Quote:
Originally Posted by David Henry
The extractor is not supporting the case body when at peak pressure. The bulge that you pictured is where the case expands when it is fired, the brass flows outward onto the extractor surface. The JGA Anschutz and Zella Melis single shots along with countless others of Austrian pedigree with their draw back extractors are famous for this anomaly. You can possibly source a new extractor from the internet to cure this or build one up your self and hand fit to better support the cartridge in the chamber. Of course both options far out weigh the value of the firearm your trying to repair. Not like that's something new to a gunsmith. D.H.
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You nailed it 100% David. In fact the gun is a JGA - Zella Mehlis. Made in 3ermany (that is not a typo). Yes, the extractor is the cause and will have to either be replaced or repaired. I did give a slight clue to the problem by stating that location of the firing pin @ 12 o'clock and the bulge at 6 o'clock (extractor location). In spite of the stock being cracked in several places and repaired with a mix of screws and nails, it holds "sentimental" value for the owner. Whenever I hear the word sentimental, I'm immediately thinking "this could be interesting", knowing that the fire arm value likely does not exceed the price of scrap metal. Good call D.H.
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08-11-2017, 07:40 PM
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Join Date: Feb 2013
Posts: 1,851
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I had a new chiappa that mangled and stretcb
Hed cases something like that and it spit stuff in my face. Good thing i always wear glasses i dont know how anyone feels safe without them. Took them a year to repair it
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