One thing I will say about GC is that I have yet to get a black calf out of him. They can get kinda funny colored for us. Breed him to a char or smoke and you will be fine, breed him black and you will be fine. I would protect him a tick on the front end making sure the cow is a bit cleaner fronted. he will make them grow so if you are scared of calves getting too big then use him on smaller cows. Personally we never had any problems with birth weight, others have so I would make sure you dont breed him to a cow that is known to throw it. I hope this helps!