swmays, a feeder will broadcast protein pellets, JUST be sure the inside stays dry. We throw a 50% corn 50% protein. We buy ours at the Co-Op in Greenville, price depends on percent of protein I think we use 16 or 18% around $8 for 50lb bag.
The pellets/corn both have moisture in them. A very tight lid on a metal feeder barrel or plastic feeder barrel is part of the problem if the feeder clogs up or battery dies. The pellets and corn will both heat up and that moisture/condensation will rise to the top of the barrel. It forms water droplets if it cannot escape or vent out of the feeder. As long as the feeder is clogged, it will then rain back down inside the feeder causing the feed to mold.