I am pretty sure that the only way to make sure the end user will print it at the proper size is if they use PSP or Photoshop. (And I think you might even have to send it to them as a psd.) The only way to get around it would be to change the dpi to 72 and adjust the sizing by pixels/inches. I am only a medium range photoshopper though so someone more knowledgable could swing by and prove me wrong.
__________________
|