For years I was a serious high power rifle competitor. My first forays in the internet were the high power forums. This type of competition is done at 200, 300 & 600 yards with long range at 1000y, almost exclusively with iron sights.
At longer ranges, all other things equal, it pretty much becomes a battle of you against the wind. Without going into too much detail, how you adjust your sights for wind is expressed in "minutes" or minutes of angle. So if you ask someone coming off the line. "How much wind did you have on?" He might say 1 left, or 2 right.
So I became tworight, with a nod to the down under expression. It was taken somewhere, so 2right now just 2wo...John