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We just processed our first batch of meaties (Rangers) at 12 weeks...the dressed weight ranges from 5 1/4 to 7 3/4 lbs, with only two out of 20 under 6 lbs. And weeks 8, 9, and 10 we had a horrible heat wave, temps near 100 with high humidity (in Upstate NY!!!) and as I said, it was nonstop for three weeks. The poor birds sat in the shade, dug into the dirt, wings out, panting, for most of every day. I know they didn't eat much that whole time, pretty much only morning and evening. I can't imagine how big they'd have been if they'd actually eaten for those three weeks!
And we had them in a new run, but not big enough for real free ranging, so this was all on commercial feed. Now, though, I might try the Rainbows for comparison. The Rangers have a good amount of breast meat, and the first one we roasted was 6 1/2 pounds - we got eight adult meals from it, not counting soup from the carcass. Not bad for a "real" chicken!