He Got Gun
I completed the certified rifle course and am now the designated rifle operator for my squad. We fired thousands of rounds in various positions and situations. The hardest drill was to lie prone on the ground looking through the sight on a target without moving. After 40 minutes of laying motionless, my neck and shoulder muscles were aching. At any moment, the instructor would call out 2 targets that we had to shoot in under 2 seconds so there was no time to stretch or shift positions.
Most of the target shooting was done from 50 yards away but we also shot from 100, 200, and 300 yards.
Here's the view of a life-sized human silhouette target from 100 yards:
And here it is from 300 yards:
I could barely see the target from this distance but was able to hit the silhouette with 9 out of 10 shots (the guy next to me didn't hit the paper once from 200 or 300 yards).