I have a 30 gallon feeder, with a funnel in the bottom, that will hold about 120 to 150 lbs of shelled corn so 350 lbs of shelled corn is about right. I would think that a 55 gallon barrel would hold about 100 to 150 lbs of shelled corn still on the cob. At $15 that would be a good price. We payed $12 a hundred for corn last fall from local farmers.