It could be either. But usually Barnevelders have some black in the hackle that I don't see with this guy. Plus partridge rocks are more readily available. So my vote is with partridge rock.
Thanks everyone! I will research Barnevelders & Partridge Rock and see if I can figure out which one for sure. He is a very mellow guy and just gets out of our way when we walk. He does protect his hens, but isn't aggressive with people. Very thankful for that!