Gravity, I use a pvc toilet floor flange attached to the bottom of the barrel then reduce that down to two inch T to two 90s .
However we are considering no corn next season, its just a pain and expensive we can take some of that money and plant better food plots and mineral sites.
We used feed stations and do not bait, we follow the defined area rule, the corn takes the deer away from our plots.
We are non residents and pay too much already. Will still feed them up pre season.
Hell before the defined area or baiting rules the neighbors were pouring the corn when we did not and we still filled our freezers and took good bucks.