How do you guys measure round horn heads such as the Big Horn. I see it beats the old World record by over 10" but that must be a cumulative 10" rather than a 10" greater spread or some other singular measurement?

With our round horn heads e.g. feral goat, chamois and Himalayan tahr, we have a cumulative score system for the books but for the visual aspect place emphasis on the spread for feral goat and length of horn for chamois and tahr.