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Been honest, I don't know if there is going to be a correlation between horn size and body length. In fact, if you check the modern cattle, when the people want to estimate its size they use chest girth, not body length and that is the correct/normal form used to get the weight of bovines.
I provide you with information of the gaur size and horn length, if you have the time check if there is correlation between horn lengths and body length, but I think that is not.
* Cooch Behar, 1908:
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* Hornaday, 1901:
*This image is copyright of its original author
* Rowland Ward, 1914 (the other gaurs not in the book of 1908):
*This image is copyright of its original author
* Morris, 1937 (only two bull heights, may be useful):
*This image is copyright of its original author
There are other body measurements (like Brander (1927) and Campbell (1842)) but do not have horn measurements, so they are not useful for you. So it seems that only the Maharaha of Cooch Behar and Hornaday took note of both (horns and body), although they did not weighed any of the bulls/cows hunted.