Hahahaha! Actually the largest bull I've ever taken with a rifle was one I shot with a.257 Weatherby at 385 yards, and I'm damn glad I had that rifle along.
He was leaving the country, along with 7-8 cows,( bumped by other hunters) and luckily he stopped and looked back, before disappearing into a cedar jungle. There was no time to range, just point and shoot. I put a 120gr partition through both lungs from prone.