I am about to process my first ever batch of Freedom Rangers. I think you'll like them.
Ours were 10 wks old on Wednesday and will butchered tomorrow at 10 1/2 wks. I don't want them to get any bigger (5 - 6 lbs live weight).
I kept them on non-medicated chick feed the entire time. They ARE still chicks after all and the Broiler crumble is only 1% higher protein than the chick starter. Chick starter is cheap in 50 lb bags.
I gave them 24/7 access to feed INDOORS until they were 2 1/2 wks old.
I moved them OUTDOORS at 2 1/2 wks. Fed them 24/7.
At 4 weeks old I moved them into a larger protective enclosure. I kept them in this until they were about 5 weeks old. I began to let their feeder run out of food now and then.
While free ranging, I've fed them once every two days - meaning that I filled up their feed trough and let them eat until they ran out. I let them go with out food for a bit and then fill it up again. I was hoping this would encourage them to forage and it seems to have worked very well. They love exploring. It's nice to see them wandering around and acting like normal chickens. I don't mind that they're not ginormous, hulking, barely-able-to-move beasts. I'd rather they be happy, roaming, crumble/bug/grass fed, healthy birds.
They return to their enclosure at night. They roost on a 2x4 board placed about 1 foot off the ground or dog pile into the nest box I had put in for my other birds. None want to sleep on the dirt anymore.