Barley for Irish Whiskey

[Boda Getta]

I want to make a batch of triple distilled Irish Whiskey using a grain bill of 50% raw barley and 50% malted barley. Finding the malted barley is, of course, no problem. The raw barley is another matter; I am in the South and none of the brewing stores nor feed and seed stores carry it in affordable 50 lb bags. A local feed store can order "seed" type barley. Is there a difference between "seed" barley and cereal barley? Will this "seed" barley work in my grain bill?
Any help greatly appreciated.

BG