Whats the most efficient way to feed free range chickens?

I have a flock of chickens on my farm and they roam freely. I want to feed them in a way where feed won't be wasted, it seems wasteful to just spread feed over the ground. I've tried using home made bamboo feeders, but my chickens tend to peck at each other when at close distance, and only the biggest seem to get their fill this way. I just want to feed them all properly without wasting feed. would love suggestions.