If you let bobwhites go you'll never see them again. Coturnix might be able to caught at the end of the day but it's just a bad idea.
It is against the law in some areas without permit, since free ranging a bird with no instinct or desire to return is essentially releasing them. You should call your state fish and game office first to find out if it is even legal. Every state I'm aware of also require a permit to keep bobwhites. You can obtain permits to release them for hunting purposes but that's about it. Honestly it's not good for your local eco system either our domestic birds can carry diseases that could wipe out entire flocks of local quail. That's leaving aside the fact that hawks, falcons, crows, ravens, cats, dogs, bobcats, raccoons, skunks, weasels, foxes, snakes, and anything else with teeth or a sharp beak would love for you to free range your quail Also most parasites they get spend some portion of their life in an intermediary host such as ants, flies, earth worms, crickets, slugs, etc. They have little resistance these parasites, and while any caged bird can get them free ranged birds are much more likely too.
