Problem fixed, turns out that an overly tight chamber was the culprit, causing the .22lr cartridges to not chamber fully and detonate about 1/8" out of battery.
Let me start this off by saying that this was bought as a second hand rifle.
No injury sustained due to careful use of the gun and proper safety equipment, despite the extractor blowing out of the gun at high speed.
This has now happened a total of three separate times, despite changing the bolt, trigger assembly, and other internal parts, and rebuilding the gun from the ground up in between. These parts were swapped directly from guns that were working perfectly before hand, and failed when combined with this barrel and receiver combo.
The barrel was removed from the receiver, aligned correctly, and tightened down correctly on the last occasion by myself.
The only common aspect is the barrel and receiver combo, which has failed 3 times now, with three different brands of 22LR.
I shot it a total of 5 shots today before it went KB, rupturing the case around the rim and blowing out the extractor and extractor spring. (These were recovered a short way away from the gun with no apparent damage, and fit back in the bolt and appear to function fine.)
Examination afterwards of the ejected cases from the prior shots show extreme stretching of the cases around the rim, when compared to a standard range pickup .22lr from the range floor.
The gun prior to the KB.
The aftermath.
During disassembly at home.
Note the headspace with a 22LR dummy. (Blue dummy, picture taken from the bottom through the empty magwell)
As far as I can tell everything is normal, but let me know if I am missing something.
This is the headspace of another 10/22 of mine that runs flawlessly.
The two guns compared. The one that KB'ed is the top gun.
The cartridges. From right to left, a standard range pickup 22LR, two stretched casings fired from my gun, and the ruptured case.
This is the barrel and v-wedge notch on the gun, with the wedge removed. Note how the end of the wedge sticks out just past the end of the receiver wedge slot. Is this normal?
Help me out here, I have no idea why this gun continues to rupture cases despite rebuilds. What am I doing wrong, or what is wrong with my equipment?
Let me know if you need any measurements or photos to clear things up.
Thanks.
Let me start this off by saying that this was bought as a second hand rifle.
No injury sustained due to careful use of the gun and proper safety equipment, despite the extractor blowing out of the gun at high speed.
This has now happened a total of three separate times, despite changing the bolt, trigger assembly, and other internal parts, and rebuilding the gun from the ground up in between. These parts were swapped directly from guns that were working perfectly before hand, and failed when combined with this barrel and receiver combo.
The barrel was removed from the receiver, aligned correctly, and tightened down correctly on the last occasion by myself.
The only common aspect is the barrel and receiver combo, which has failed 3 times now, with three different brands of 22LR.
I shot it a total of 5 shots today before it went KB, rupturing the case around the rim and blowing out the extractor and extractor spring. (These were recovered a short way away from the gun with no apparent damage, and fit back in the bolt and appear to function fine.)
Examination afterwards of the ejected cases from the prior shots show extreme stretching of the cases around the rim, when compared to a standard range pickup .22lr from the range floor.
The gun prior to the KB.
The aftermath.
During disassembly at home.
Note the headspace with a 22LR dummy. (Blue dummy, picture taken from the bottom through the empty magwell)
As far as I can tell everything is normal, but let me know if I am missing something.
This is the headspace of another 10/22 of mine that runs flawlessly.
The two guns compared. The one that KB'ed is the top gun.
The cartridges. From right to left, a standard range pickup 22LR, two stretched casings fired from my gun, and the ruptured case.
This is the barrel and v-wedge notch on the gun, with the wedge removed. Note how the end of the wedge sticks out just past the end of the receiver wedge slot. Is this normal?
Help me out here, I have no idea why this gun continues to rupture cases despite rebuilds. What am I doing wrong, or what is wrong with my equipment?
Let me know if you need any measurements or photos to clear things up.
Thanks.
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