This is not math, this is engineering, which is a field I care about even less, yet:
Given the nature of the cubit unit (whose forearms were used? how many people contributed to the measure?) and the way of measuring (how straight was the line of forearms? did they use marks? were they really perpendicular when marking and looking at the marks?....) the results are:
Shotgun Pi = 99.67%
Bible Pi = 80% to 110%, and those who claim that thing approximated Pi to a billion decimal places can't be proven wrong.
OTOH the exact value of Pi in the Bible and the universe collapsing over the mass of an infinitely long book would have been quite a sight.