In your case Mathman, I apologize. You merely asked a reasonable question and did not cast aspersions.
Like I said, the turret is zeroed with issued ammo at a known elevation/temp and that data recorded, along with zero changes for other gear like the UNS and a suppressor. For a potential engagement at a variety of distances, this is a no-brainer. A smart guy doesn't have to ponder this very long to see the wisdom of it.
Also bear in mind that the guy behind that scope may have been in overwatch for an assault element that has not arrived for a day or more, after having made a night parachute jump with little sleep for days prior to that. The system works.
