Underwood case blowout over on 1911Forums

[DAVIDF]

I definitely will. I have looked a bit, particularly at the Underwood pull downs. I will again in more detail before I actually purchase components.

[RRMan03]

I look at his and let me see if I got this right. 454 Casull was an overload,475 Linbaught was an overload,500SW was a big overload and at the beginning blew up guns left and right. Reason i  know i watch at the factory as those frames came apart. So really the guns were builtto the ammo.That has not been done with the 10mm that i know of. Correct me if I am wrong. I am not talking about a 3500 custom made for a certain ammo. This is just a good question and if we keep the cabinet meeting together with no vacations and leave the lobbiest out of it I think we can fix it.

[REDLINE]

I look at his and let me see if I got this right. 454 Casull was an overload,475 Linbaught was an overload,500SW was a big overload and at the beginning blew up guns left and right. Reason i  know i watch at the factory as those frames came apart. So really the guns were builtto the ammo.  That has not been done with the 10mm that i know of. Correct me if I am wrong. I am not talking about a 3500 custom made for a certain ammo. This is just a good question and if we keep the cabinet meeting together with no vacations and leave the lobbiest out of it I think we can fix it.

SAAMI makes Proof Loads available to all gun manufacturers that care, and therefore all gun manufacturers have the option of building their firearms around them.  SAAMI's proof cartridge pressures for 10mm =

Minimum Average = 50,500 PSI
Maximum Average = 54,000 PSI
Maximum Extreme Variation = 9800 PSI 

[The_Shadow]

I wish I could have gotten a sample of those loads to dissect and inspect for more than normal powder charges or cutting away the brass to look for issues.

Once the unlock/barrel tilt occurs the cartridge is starting to move back as well, the pressures although should be dropping from peak pressure are still quite high, brass has be heated to extreme temps so these things are adding to the situation.
As the brass starts to shearing and being pulled out of the chamber it has even less support, hence the case doesn't fit when placed back in the chamber to fully headspace flush with the barrel hood.

The question still exist did the brass have issues that are not noticeable to the users, or ammo makers?

[Intercooler]

   I never heard back from him. I just sent the suggested ones posted the other day with my thoughts and he can do as he wants with what was forwarded. To keep my level of sanity tolerable  my chapter concerning Underwood is closed for good. I haven't had any issues with anything made from start until turning the last page and don't plan on remotely getting involved in issues if/when they surface. My only driver was to try to figure out what were the issues that led up to problems, but will let more knowledgeable people theorize.