If you're interested in long range shooting, sniping or just learning more about the mad science behind it all, this series of videos from YouTuber Tiborasaurusrex is a wealth of free, excellent quality information. He's up to like video 24 or 25 now, and they'll all quite thorough, no B.S. discussions of the subject matter at hand. Ammunition, rifles, scopes, support gear and the technique and calculations behind extreme long range (over 800 yard) shooting.
Worth checking out!