I don't know if these helps, because I've only got maybe 50/50 odds (on a good day) of scoring a hit right now, but I manually calculate the target's speed sometimes in order to check what was going on. I use the stopwatch to count the rate his bearing his changing in degrees per minute, B. From there here's what I do:
B * 60 = b (Bearing rate in degrees per hour)
b * pi / 180 = w (Bearing rate in radians per hour)
R = Stadiametric range
w * R = V (Target speed in yards per hour)
V / 2000 = v (Target speed in knots)
Usually, if I'm going slow, that works out to be pretty close to the target's speed. In fact, when I do it this way, I often do better hitting than when I use the sim's automated tools.
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