As in any endeavors, training helps, but not all elements of The Knack can be taught. Positioning, concealment and stealth are as important as bullet placement necessary to ensure survival of the shooter and spotter. I worked with a younger man who served for 5 years as an 11 Bravo. He also had his sniper's badge. In sniper school, one of the first thing done is each trainee sews and glues up a ghillie suit from scratch.
The man had no gun handling experience before joining the army. Some of the best shots don't have a background in hunting or marksmanship, but their advantage is no ingrained bad habits. Training was on a clean slate. Gil