which type of feeder works best

[Wallis]

I plan to feed my chickens "Scratch and Peck", so what style feeder will work best for their whole grain feed? Can I use a self-filling type or must I put it in an open-style pan? Thanks for comments.

 

[ChickEngineer]

I have tried both mash and pellets. The mash was too much waste for me, pellets in a Little Giant hanging feeder worked best for me.
I feed Organic pellets and scratch.