I am planning to try pumpernickel for the first time but having a little trouble finding rye berries locally.  In particular, a bread as similar in ingredients as possible to Chad Robertson's Rugbrot.  Recipe here: http://abreaducation.com/blog/2012/08/chad-robertsons-rugbrot/ [1]

Is there a substitute for rye berries that will work close enough for what I am after?  I bought some steel cut oats today.  Maybe those?

John