ok, I have to ask: I am very far from an expert, but are you sure thats pignut hickory?
If so then the pignut I have (which was unanimously identified by me & 2 guys who work for the game commission in the "habitat" group) isnt pignut... which is certainly possible, but I dont think so - I have both pignut & shagbark on my property, I've cut up a half dozen of each for various reasons. They were all white wood thru and thru, none of them have a dark center like that. All were very typically "hickory stringy", I dont see any of that in your photos either.)
It is nice looking wood, and I'm not trying to disagree, just askin.