My experience with guided hunts, is to trust the guides you are with. I have a conversation with my guide when I arrive about what I'm looking for. First and foremost is a great experience. I'll trust them when they tell me if the animal is a shooter or not. You can tell by their excitement, body language, etc. if it's something special or "ehh, it's legal....". Again, my experience, the guides I've had are also looking for the best animal they can find and have not been inclined to take "an animal".
And as brwnbr says, generally 99% of the questions from others are "how big?" vs "how was the trip?" when the latter question is the most relevant. 99.9% of these people will never go on these hunts nor have any experience with the size; it's just a question that seems relevant.
Would you rather come home with a 10' bear and a crappy attitude guide or an 8' 6" bear where you and the guide worked hard and had a great time?