Adobe Reader messing with print size
Printing from Adobe Reader shrinks the page “to fit”
(by default). Unfortunately, its calculation doesn’t consider
the existing margins of the document, so that it shrinks what it
believes is your whole page onto what it believes is its output page.
The effect typically looks as if your margins have expanded.
Solve this problem by adjusting the Reader’s default in the
print dialogue; unfortunately, this dialogue varies from one version
to the next. On Reader version 7, there are two entries to
check:
Page Scaling (default: “Fit to printer margins”) — change to
“None”, and
Scale (default 95% of Normal size) — change to
“100%”.
This question on the Web: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=acroantics