But I gotta ask, what manual are you using, that it does not specify primer? If the answer is "I am not using a manual," then please obtain and read a good one before you load a round. Hornady seems to do a fine job of explaining the whole process, and I can't help but feel that far too many of the questions I see on this forum can only arise becasue folks are not reading the manual. Really. They are fascinating, and they are written by genuine incurable gun fanatics who have access to both unlimited components and amazing instrumentation.