Oneida, do you feel that the mineral mix keeps deer from overeating? I have seen cattle farmers do this in a bunk feeder. Makes sense to me. I keep salt blocks out all winter, but don't know how much they get used. I would say genetics has a lot to do with what potential you have in your area, followed by their diet. I have hunted 3 different regions of our state, one is pine country, hill country with hardwood and pastures, and ag production with hardwoods. The most consitently large deer are in the ag areas. Larger bases and overall inches. Hill country next followed by the pine tree areas. I know there are exceptions to all, but the availability of high quality year round food helps tremendously. This is where food plots help a lot in my opinion.