Coop is 12x12 with sand floor, run is 700 sq ft, +/- a few feet and is about half under a carport style roof, fine gravel as base in run. Birds are out to free range anywhere from 4-10 hours a day, depending on my work schedule. When out they have both yard type range and rocky hillside (bug central), a few pine tree areas (dusting heaven) and woods, power line with random piles of brush and logs.
We use unmedicated, at all ages...
Broody hens and chicks get chick starter for about 2 or 3 weeks, then the broody moves them into the main coop and we put flock raiser (20%) in till chicks are abou12 weeks, then everyone is on layer crumbles (16%)
We have feeders of regular layer in the coop at all times, but it is set high enough on wall the chicks can't access it till they get older, the one we fill with flock raiser is mounted much lower and is the one the broodies and babies use 80%+ of the time.
There is free access to both grit and calcium at all times.
Scratch is usually a combination of our usual feed mill scratch (Corn, wheat and barley mix) mixed half and half with the mills wild bird seed (corn, sunflower seeds and millet)... I figured it out once and it would work out to about 12% +/- protein.
It has worked well for us.. ..though this year I don't think we've been able to do away with the flock raiser since last December, since we have had broodies and babies since mid winter on....