BING-GO!...
Calcs are easier, actually hitting something at distance is a different story
...
It's easy to send a bullet from most any rifle a mile (and some to 5+ miles). Predicting where it's going to land *accurately* is the hard part. Doing that when there are high velocity kinetic events with your name on them is the separator between a cool professional and the rest of the world.
I can tell you first hand walking a bullet at a mile 10 yards left or right is way more difficult than you can imagine if you haven't tried it.