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How far down can one go before it starts to get dangerous?
Did you try my ballpark method? Just use that, assume you neither gain nor lose muscle and plan your cut.
If you MUST know, get a DEXA and be done with it.
Read this - it's what I usually suggest to people when they ask about their bodyfat.
http://www.ironmagazineforums.com/anabolic-zone/96193-fast-action-s-drol-cycles.html#post1859290
Actually, DEXA is the new gold standard.