I've found that pdf actually makes this situation better.
make sure your printer driver, or your print request is not trying to scale the output.
if you have no other choice, view the pdf at 100% scale, do a screen capture -- SHIFT-PRTSCN and paste it into MSPAINT. Then crop it to contain ONLY the part you want printed, and print that resulting (smaller) bitmap out with no scaling, and small borders.