I have used Firewater, Montezuma, Revelation and All State.
By far, the best calves are the Firewater calves. They put some bone in, lots of muscle, easy fleshing and are easy on the move. In my opinion, the Firewater calves can be a little higher strung than the others.
My Montezuma calves have been a little bigger in frame score than I mighty like, but he adds some width to the top and they move out on nice feet and legs. **don't use on heifers
Revelation has thrown some really nice heifer calves for me, they milk well and are very easy fleshing. They almost get fat on air! They are more moderate framed.
All State has been the most inconsistent sire that I have EVER used. He can throw a good one, but then breed him to the same cow the next year and the calf will be totally different. I haven't seen many All State calves that turn my crank, a number of mine have had trouble moving on their back wheels.
For larger framed Charolais cows to get some more thickness, bone and muscle I would go with Montezuma or Firewater. I have attached a photo of a Montezuma daughter in our area that has done very well. She was National Junior Beef Heifer Champion and Reserve Charolais Female at the Royal Winter Fair in Toronto.