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The problem with regular heritage breed birds for meat, is the time they take to grow out. I love them, myself, because they taste better, but they won't be tender fryers or grillers if you wait for full growth. For example, JG's may take almost a YEAR to reach those weights you show. That's because they grow skeleton first, to support that big body. There are many breeds that get fairly hefty by about 20-25 weeks, and a lot of people butcher younger than that (anywhere from 14-20 weeks) for a more tender bird, even though they'll be a lot smaller.
I'm experimenting with cross-breeding heritage breeds to get somewhat faster growth, but not like the Cornish X's. I'm just shooting for a reasonable sized meat bird (maybe 3-4 lbs) by around 12-14 weeks. With hens that lay a reasonable number of eggs, and I want healthy birds that can live a long time, mate and produce fertile eggs, without any help from me.
There are those who think this is a stupid thing to do, but it's my preference.
The reason I mention all this is that if you are fairly new to raising chickens, and the Cornish X's are what you're learning on, the dual-purp/heritage birds will be a whole different ball game. They won't grow anywhere near as fast, nor will they have those plump breasts. They will be healthier birds, more active, have more flavor, forage well, and be able to reproduce like normal birds, because they are normal birds. But if you are expecting growth anything like the Cornish X's, you'll probably be disappointed. This is not to discourage you, I'm all for alternate meat birds, but just to let you know more or less what to expect.