Now I see, swell and bust a gut. Reminds me of back when I was a tough guy and ate dried prunes for breakfast, drank a glass of water for lunch, and let em swell for supper.
I really don't think there's a problem without cookin grain. Most folks soak it so it will sour before they use it for chum anyway, and that will swell it. If ya sink it dry, it's not gonna be dry for long, and I'd think if a fish got a belly full of dry grain and it did swell, the fish would puke it up.
Just my thoughts, but if you're concerned, just soak it for a few days....oh, by the way, got a little still? Ya might make a little fuel outta that stuff before ya dump it in the lake hehehe.