Thanks everyone. The rest of the story is pretty simple. Spotted the bull at about 700 yards and knew that he was everything that I had dreamed of. Closed the distance to 546 yards and got set up with my rifle over the guides tripod and watched him as he bedded down. Waited for an hour and a half and finally decided to shoot him while he was bedded. Sent a round and he never moved. Doesnt get any better!