Several of the members of the group I usually play with are around measurements all day. Thus we are fairly good at judging distances. Since technically you can only remove models within range of the weapon, we would often times move the figures and rapid fire on that lead Sgt., or that lead few guys. 16 bolter and 2 plasma shots usually kills the 2 or 3 within range.
Ohh Most memebers of our groups stopped moving around with a triangle, or blunted triangle formation. Now most people advance in small blocks to lessen that problem.
For every battle honor, a thousand heroes die alone, unsung and unremembered.