Absolutely. I've got a 18ish week old Freedom Ranger roaming around the farm that weighs almost 10 pounds on the foot. He's been free range and has lived with our laying flock since he was 8 weeks old when he weighed 4 or 5 pounds, which is when we usually butcher them, but I have seen 6 pound dressed carcasses from freedom rangers pretty consistently under 10 weeks. Depends on how they are fed and how much exercise they get. Generally we raise them for 7 to 10 weeks in salatin style pasture pens moved daily across good pasture land with lots of clovers so all those numbers are based on that style, which is rather intensive I guess. It seems that most people that raise freedom rangers like to completely free range them from out of the brooder, which is great and definitely easiest, but the best growth out of them is them is with a closely managed feed ration and movement control - would be the same with any chicken I imagine.