Those taper number's are based on using 1 fid length as the taper. I am not sure where that specification came from however. I am not the originator of that chart.
Personally, for dynaglide or amsteel 7/64, I've always used about 1-1.5" for the taper, and just eyeball it.
The idea is to have a smooth transition to the larger diameter of the buried portion, as sharp transition's create a stress concentration (area where the effective load on the line is larger than the actual load - therefore it will fail at this point when it fails, and before the true breaking force is reached. This is part of the reason why we have safety factors).
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