This ring is an intentional part of the chamber design... I don't have much time at the moment, but if you do some searches on the forums for the word "stepped" or "Chamber" you should find some discussion and an extract of the chamber blueprint which will provide all the info you are seeking.
The original chamber was machined as a stepped cylinder rather than tapered. I presume for ease in manufacturing. Modern chambers no longer use this technique and more closely folow the actual cartridge design... in this case - tapered.
I hope this has been helpful.
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regards, -John S
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