Case Rupture

  • Last Post 24 July 2019
  • Topic Is Solved
Bud Hyett posted this 24 July 2019

The last target and I am shooting the best since the bone graft surgery. Third record shot sounds funny, does not print where pointed and the case looks like a .32 S&W Long coming out of the chamber. Case rupture. 

Get home and try the oversize brush. 35 caliber, a shot of Break-Free, and push from the muzzle. Case neck still stuck. Use a .44 caliber brush and, another shot of Break-Free and the case is still stuck. Then clean the chamber with lighter fluid, a shot of Kroil, ten minute wait, a few choice words, the .44 caliber brush and the case is still stuck.

Next is the Cerro-Safe method. Disassemble the rifle (easy with a Stevens 44 1/2), clean the chamber again, push  cloth wads from muzzle to chamber for a dam, pour in the Cerro-Safe, wait five minutes, gentle push and the case neck came out with a gentle push.  

Next time, I will just go to the Cerro-Safe approach at the beginning. 

Having several hundred back up cases, I will go to them for the coming matches. In the meantime, clean all cases with the tumbler, detergent and steel pins. This will clean them as bright as new and they will be easy to examine for incipient cracks. Examine them and throw out any suspicious cases.

The slight shoulder of the .32-20 CPA must still be a stress collector and cause an eventual rupture.

Farm boy from Illinois, living in the magical Pacific Northwest

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Fitzpatrick posted this 24 July 2019

Do you aneal cases ?


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Ross Smith posted this 24 July 2019

Thanks for the info, I'm bad about not cleaning my "load at the bench" cases.

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Bud Hyett posted this 24 July 2019

Good question. I have not recently been annealing cases, but I am to start again. These are Starline brass and the last case lots have been harder. I tried necking this lot down to .25-20 and had case neck collapse using several steps.  This was using Imperial Sizing Die wax which I have had good experiences with before.

Alice's rifle has need of improvement and annealing these .308 cases may help also. They are Lapua and have been shot for two seasons, A day of annealing, trimming and beveling may be in the near future. I have had very good experience with Lapua for case neck uniformity and now the necks may need turned. Also throat her .308 out a little so the base of the bullet sits farther into the neck of the case. 

Farm boy from Illinois, living in the magical Pacific Northwest

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