You are spot on! Not to mention that as long as the gyro angle is low, say within 30° of your bow, range hardly matters to the computation of lead angle. It’s only when the gyro angle gets large, especially at close range, that accurate range input into the TDC makes a big difference, due to parallax. Hence why it is always best to minimize the gyro angle to the extent possible, to eliminate one potential source of error. Then you can get away with ballparking it, as was typical in real life, estimating the length of the target and gauging range by how much it filled the optics when close to a 90 AOB. Lots of mentions of this in KTBs.
I always recommend people play with the TDC to see these impacts. Move the bearing so that the gyro angle is low, and then turn the range knob through its entire throw and watch the gyro angle - it will hardly change. Now do the same thing, except move the bearing so that the gyro angle is very large. When you turn the range knob, the gyro angle now changes significantly.
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