Unless your image has the same aspect ratio as the page, you won't be able to scale it to fit the page without distorting it.

In any event, very few printers can do full-bleed prints, because of the reservation of an area around the edges for the paper handling mechanism. Consequently, images that do go to the page edge are liable to be cropped - which a Print Preview should normally indicate.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]