chamber wall thickness needed.

[mtbugle]

working on a 357 insert in a 12 ga barrel. I want to fabricate an ejector that slides in bottom of insert. Does any one know what thickness I need to maintain for chamber and barrel walls? This would be for 357 mag. I would also be interested to know how thick needed for 357 max pressure for a future project.
thanks Don.

[SHOOTALL]

If you have access to a thompson center encore could you measure their extractor ?

[trotterlg]

Make it up as thick as you can, this is one for a Hornet, it didn't blow up.  Larry

[mtbugle]

Thanks for the input Larry. I am modeling simular to your project. I just won't have near the fancy milling and lathe equipment to help it to look nice. I figure a ground down grade 5 bolt should be tough enough to handle it. I just was also hoping some of the metal enginers would have a good idea of required thicknes to maintain for these two chamber pressures with a good safety margine. I will have to look up the hornet chamber pressure as well as for the 357's to compare.
Thanks Don.

[quickdtoo]

The problem will be getting the SAAMI MAP for both using the same measurement method, Hornet is CUP, the 357 is PSI. 

Tim

http://www.handloads.com/misc/saami.htm

http://www.leverguns.com/articles/saami_pressures.htm

[trotterlg]

If you look at that ejector it is a grade 5 aircraft bolt machined down.  Larry