OK, this was the bull I thought you might be talking about. I used him a couple of times, probably about seven years ago. Based on my records I don't see that the calves were born much earlier than their expected birth date. If you bred him to a first-calf heifer, I would probably start watching for signs of calving around 14 days before the expected birth date. That is just my standard protocol. If you need help with some of the things to watch for, we here on the forum can offer help. Best wishes and good luck! :)