Hey prarie,
The guys are right about dote, punk, decay, whatever you call it in wood. The fungi that causes decay in wood is some amazing stuff. Even if you sure about the produces you get it from, be sure to seal it well. All these fungus's needs is a little warmth, food (cellulose/sugars) and air. Don't give it a chance to get going again.
Pecan is hickory. In the hardwood inspectors rule book it says, "...lumber inspector shall make no distinction between hickory and pecan." Even experience inspectors have a hard time telling the difference.
So to answer your question, it's hard, dense and very long grained/fibrous stuff. It was among the first exports from the New World back to Europe for that reason. Hickory/pecan was the reason for the Revolutionary War, not tea! ;~)
Ok, history lesson over. It does have a tendency to split and crack as it drys. So I'd say, cut the pieces 1/4 to 1/3 longer than you need the finished pieces to be. Seal the end grain well with wax and make sure it's dry before you use it. It will shrink some as it dries (about 4-5% the best I can remember), but the cracking bit is what will wreck your hard work.
Hope that's what you're lookin' for. Hickory/pecan will make a great, very durable handle material. Lookin' forward to seeing what you do with it.
Oh, and your right. Karl's work is as good as it gets. That guy's good!