I'm curious what you want to do with nutmeg hickory nuts. I've been looking for a tree in the area around Selma Alabama but so far have only found mockernut. Carya illinoinensis is also native to that area with so many trees that I can't tell what was recently introduced from natives.
I've found Carya Glabra, Carya Cordiformis, and Carya Tomentosa all within 30 miles of my house in northwest Alabama.
I found a large stand of trees south of Selma about 30 miles in an area bordering a creek. Unfortunately, all the nuts I found had black watery kernels that are not viable. There was abundant evidence of squirrel pilfering suggesting they got all the nuts that were viable. The stand of trees includes one that is over 2 feet diameter and several that are 8 to 12 inches. Nuts are typical of the species. Leaflets ranged from 5 to 7 on the trees I saw and were distinctive for lacking any hairs typical of other hickory species. One caution about these trees, several of them showed hard diamond marked bark similar to Mockernut and not typical of Nutmeg hickory. There is a possibility this is a hybrid stand of trees from a long ago cross of Nutmeg hickory X another hickory species. The trees grew in association with swamp white oak and other hardwoods typical of the area. This link is of the location of the trees which are about 200 feet inside the tree line.