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It appears that the fired case shown in your picture has been fired in an "improved" chamber, created in an effort to enhance the performance of the cartridge. Will the action close on a fired case?

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I agree! You'll need to do a chamber cast and have custom dies made for it. On this side of the Atlantic I'd use CH4D to make them. I've talked to (IIRC)Dave, the owner and he's very sharp about chamberings.
http://www.ch4d.com/
But I don't know who does this on your side.

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"When you see that in order to produce, you need to obtain permission from men who produce nothing; when you see that money is flowing to those who deal not in goods, but in favors; you may know that your society is doomed." Ayn Rand

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