Lynx the 1.5 K shot isn't all that tough, well within the osti range. 1.5 to 2.0 is more difficult.......but do-able. The further out, the harder it is to zero in on ur target. Not only do you have to consider lead, but also elevation...........is target climbing or decending........speed of target.....etc. etc. etc. Past the 2.0K marker.......well quite frankly is what we call the "Golden BB" shot............"Spray & Pray". If one hits, ya reach around and pat yourself on the shoulder.
Hawker you hit it right on the head.......training. One of the reasons LTAR has their Rep with an Osti is because the squad actually trains with them in the DA & TA. Every time there seems to be a low in hitting targets, it's off to the training fields, do some tuning up.
Longest "Golden BB" shot I've seen 3.5K, C-47............yea should've heard channel 200 on that one