RichThesaurus
go out on a limb
vs
go so far as
go out on a limb
verb
To take a risk.
To hazard a guess.
go so far as
verb
To reach an unexpected extent in doing something.
How often have the words
go out on a limb
and
go so far as
occurred in a corpus of books?
(source:
Google Ngram Viewer
)