It would be better if would give some more specific information on Printer you are using. Normally pre-printed pages are printed in dot matrix printers. If you are using one of them, then RDLC would be a bad idea to handle the printing operation.
If you can consider printing using different technique, you can refer to following link. It looks a little more complex than using RDLC (and surely it is.. i know) but would save you from pain in future.