I am experimenting with three breeds, Cornish Chancler Cross with White Rock , Cornish Chancler Cross with white Breese, and just the white breese themselves. My Cornish Chancler Cross are mean little devils....I am on the verge of just kicking them to freezer camp early they are in with my gentle giant Orpingtons who just peck them when they misbehave. But they are little terrors. They jump on the backs of the Orpingtons who outweigh them by 10 to 12 lbs and pull feathers peck their necks, and when on the ground peck their feet. that's when the orps peck them on the head.
Not sure if iill keep them as breeders are not....maybe they will calm down seeing how the orps put them in their place daily. One even when to picking on a Guinea, the guinea pecked him back, the little devil attaced the Guinea and latched on for a wild ride. The guineas are 5 times bigger then they are!
Cornish Chancler Cross are growing fast they are at 4 weeks and the size of 6 week olds. I figure they will be butchering size at about 4 months.