Galilee is the result of crossing Mathilda Gutges and Trube Blue, producing a plant with stronger stems, bigger flowers and deeper blue tone (in acidic soils). As such, I would expect the usual winter hardiness of Zone 6 (from Mom and Dad).
Re: "one said hardy to zone 8"... note that some sites generalize hardiness for a-l-l macrophyllas in the world by saying they are hardy to Zone 8 (others say Zone 7). Some of the less hardy varieties are the Teller Hybrids from Europe/Switzerland and these usually have a Zone 7 hardiness. So double check by calling since, I guess, you are probably a Zone 6 or 6b'er, no?