Hello Olivetroad

That's a feed bin & not a grain bin, pretty steep angle on that cone at the bottom. I've got no experience with corn, but I wouldn't be afraid to put rolled barley in there or any feed for that matter, including 1 with a lot of fines. Being square, there might be more bridging than 1 that is round, but unless the stuff is damp, a tap or 2 with your hand on the outside of the cone & it'll come out.