You are correct that the action is heat treated and therefore has a higher yield strength than the barrel. Heat treating only changes the yield strength of the material and it does not affect it's stiffness because the modulus does not change. Also, most of the chamber is cut in front of the action face so any reinforcement that the action could provide is not happening. I would also prefer to react the radial forces during combustion in a homogenous material rather than having a load path through the threads. My above recommendation is to increase stiffness to decrease the chance of a stuck case, no amount of heat treat can do that.

This will be my last post regarding this topic as I do not want to hijack this post any further. I do enjoy this topic of debate, and if more people are interested in chiming in we should open a separate post.

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