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If you watch "Chicken of Tomorrow" you'll realize that "big bird" is all relative. The old New Hampshires in that show weren't big by today's standards.
Big compared to . . . . ? To commercial broilers they are small, but the best that I can tell is that the NHs in the video is close to typical of 12 wk birds (which they are 12 wks). You are right, large is relative to the object compared to. I was concerned that some that I aquired were a bit light. I weighed mine and they were a half pound shy of standard weight at 18 wks from one year. I was mentally comparing them to some BRs that are at 10lbs. In comparison, they were light.
It has been my (limited) experience that the "dual-purpose" breeds sold by hatcheries do not measure up to published standards. They make great layers, but they do not grow to standard size. And, those birds that do grow to standard size, do not do it quickly.