My Granddad had this same model feedmill. Once a week, we had to grind a full tank of feed for his hogs. Then, my Dad started with hogs and that meant 2 tanks of feed per week for both feedlots. We took the feed auger off because we were unloading from grain bins directly into the hammermill opening. Brings back so many memories
The tag on the pre-mix bag will give rations of how much corn and soybean meal to add going by the weight of the animal. Bigger pig = less soybean meal and more corn.