I agree, those are CX's.
Beware if you try to get hem that big that fast, you could have leg, heart and kidney problems.
I raise mine slower on restricted speed to get a bigger, and what I think is better juicier bird. I raise mine 13 weeks and get 8-13 pound dressed birds.
I did not realize there was a hatchery in Beaver Dam. I have been getting mine from Iowa. I will have to look up info on them.