I recently received a letter from a reader on the subject of long-range shooting and ballistics. I’d recently done a blog entry on zeroing rifles, and the reader advised me of some factors I failed to mention in the story. It was apparent he was much better informed about the science of ballistics than I, and I appreciated both his knowledge and his concern. Reading the email, and my subsequent response put me to thinking about something that can have a positive effect on the success of a shooter, whether for personal defense or as a hunter or competitor. Simply put, there is no substitute for mastery of the fundamentals.