We raise and show reg Charolais and we've found, just like people, some are easier to get along with than others. I think that is true in any breed. Alot depends on how they were raised and handled as calves. If the management was such that the cows and calves were out on the range for extended periods of time, they tend to be more stand offish due to the lack of human contact. But it they were managed in a way that they saw humans on a regular basis, they tend to be quieter. Some bloodlines are more high strung than others but reputable breeders wean those out. Nervous cattle do not do well in the feedlot and are not popular.