I made my own gravity feeder out of a 5 gallon bucket, about 3 feet of 4 inch pvc, a t split adaptor, a cap on one side of the T and a 45 degree elbow on the other, and a toilet flange to hold the bucket onto the pvc with some nuts and bolts. It hold exactly 50 pounds which I keep full year round. I fill it about once every 6 or 7 days and it works great for me. The deer know where the corn is at and after about 5 days it's gone and then they are coming back constantly to check it for the next day or 2 which works out perfect since they come in around 7am and 7pm to check if it's refilled. I like using a gravity feeder or a feeder in general because that corn isn't on the ground and it lasts a lot longer in a feeder then on the ground. I also wouldn't waste your money on that powder stuff they sell, I got a bag and all the deer did was smell it and that's about it never ate it, the stuff just molded and that's it. A feed block with corn, molasses, and other things would be another good recomendation as a secondary baiting tool along with corn in case the corn runs out and you cant fill it constantly they have something to keep them coming in until you can fill it up again.