Classifieds Archive Template Not Used

creating a archive-classifieds.php or any other custom template page doesn't seem to work as intended. If I create page-classifieds.php for example, it appears that the loop is somehow placed within itself, causing the headers to reprint.

All I'm really trying to do is make all classifieds pages full width, but that can't seem to be achieved with custom template pages. It feeds through page.php by defualt, if I create page-classifieds.php with the same code as page.php it messes up the loop. Alternatively, applying a custom template to the virtual pages doesn't cover archive pages, like category pages.