I run feeders in the winter, I feed corn and soybeans if I can get them cheap enough. My property is in east central MN, so the snow buries whatever plot crops are even left by sometime in December.
I feed at what I consider to be "supplement" levels just to give the deer an extra boost. I'm trying to preserve health and life in my herd, not maximize size/weight. I don't want deer totally dependent on my feeders all the time, but if the winters get really harsh as they did 3 and 4 years ago, I will go into full-on feeding mode and give the deer as much as it takes to make sure I don't have a die-off or does that are so stressed that they abort. Considering my overall investment in my property, an extra 100 bushels of corn is worth it if it prevents a big potential die off.
I would agree with the previous poster(s) who said go big enough. My feeders are 3 bushel which sounded big at the time, but it's not big enough. Also you have to consider how you're going to store your feed supply. I bought 55 gallon steel drums so I can have the elevator bulk load up to 8 drums at a time in the back of a pickup truck and then I unload them with the tractor loader. This is a pretty good setup as I can store a lot of feed outside, but still dry and rodent-proof. Handling stacks of feed sacks would be a big PITA.
Grouse