Yeah, it's easier with my Kahles 6-24x56 rifle scope. The old 1.5x would never get out that far. Designed for different purposes with about 300m being the range I guess. You would have had sharp-shooters in support of general infantry I assume, all doing the same things I do.

Being steady is important. Load the bi-pod forward, brace the butt-stock with a shooting bag or hand, breath in and out to about the natural pause in breathing then squeeze the trigger. The break should come as somewhat as a surprise. Other factors too of course, but that's essentially it. Takes a lot of practice...Many rounds.