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Due to many redirects (even 301s) being subject to some kind of content similarity checks (last cache of old active URL before 301, cache of new page) I don't think there's much mileage in this any more. I am pretty sure that some kind of Boolean content string similarity check is performed and if the content is very dissimilar, the 301s don't really work that well. I have no official Google quotes on this but have observed it from a number of 301 redirect migration projects and I'm pretty confident that dissimilar URLs receive only a fraction of SEO authority from 301s now