THe soybeans work well, we also feed paymaster and other blocks. Most runn around 15% and they can really attract deer if no one else is feeding them. If alfalfa is available it is also a good supplement. Some of the large ranches in TX are feeding cotton seed 35% protien weather proof and all you need is a circular tube of chicken wire and to rebar posts. stuff it with thecotton seed and leave it.