Yes, that's why have used him only on those cows, which have proven themselves with calving, or I believed that they should be able to handle bigger calves. After 100-110lbs calves from Limousine bulls, I don't expect any smaller from a Charolais.
Had to assist the last cow abit. She hasn't made any progress for around 30 min after I saw the feet of the calf. Decided that it'll be better for everyone to give her a hand. The size of the feet was a sign that it shouldn't be any smaller calf than the last one. Cow had 5 calves before, most around 110lbs, never had to help.