Something of interest
https://www.cia.gov/library/readingr...0001066239.pdf
among other things.....
....Original armor penetration estimates were 600 mm for BGM-71A/B and 700–800 mm for BGM-71C. However, according to a now declassified CIA study, the true penetration values against a vertical target are much lower—just 430 mm for basic TOW and 630 mm for Improved TOW