Pecan, Carya Illinoinensis, is in the hickory family, Carya. It is very hard and strong (and heavy) It's Janka hardness is 1,820 lbs./sq.in. compared to 1,010 for black walnut (Juglans Nigra) and 1,450 for hard Sugar maple (Acer saccharum). It is fine grained and a light brown color, a little darker than most other hickories. I once planed some hickory boards on my brother-in-law's planer and just about ate the blades out of it. I then preceded to carve a plaque to sell in Gatlinburg and that was the hardest wood I ever attempted to cut. If you do build a stock, it will most likely never break. Think axe handle.
{I studied (sort of) forestry before I got drafted.}