I got chickens for the first time a year ago and mail ordered 50 chicks. They were an assortment of multipurpose birds. About half of them were roosters. I butchered most of the roosters and they all seemed to be good sized. Not sure of the exact weight. I kept them all as whole chickens. For me at least it is easier to have them whole. Our family likes to cook them in the oven as a roast. We also boil them in water and get some awesome bone broth as a bonus.
RE: Chicken butchering