Not to be a smarty pants, but the way we get barley out of our grainery everyday is without an auger.
We use a wonderful invention called 'cleaned hydraulic oil buckets' (the big ones).
During the drought, we hand pailed 500lbs into a little old one ton dually and then hand pailed it out for the cows when we got to the pasture. Every day (even I was starting to get a killer set of pipes... which is all fine and dandy on a gent, but yikes on a lady!) and all winter. Sure was glad to see grass in the spring. ;-)
Currently we're pailing everyday for the yearlings. Takes a bit of time, but then again, we've got a fair bit of that here on the ranch.
Works well and you don't have to worry about getting your scarf caught in the auger or a PTO shaft.
Having said this, we do have to borrow a neighbour's auger (we're lucky enough to live in a neighbourhood where all of us freely lend and borrow tools/implements/labour from each other as needed) when we have to fill the grainery from the grain farmer's truck.
I suppose a person could unload a grain truck by hand, but I've a feeling that the grain farmer would get a little teed off about standing around for the amount of time it would take to do it by hand.
Sounds like you've got an excellent venture lined up with your calves.
Take care.