Hickory is great, especially for beginners as said.
Springbuck, what state are you in? I've seen two posts of yours reading today professing your love for hickory. I have access to a lot here in Wisconsin. I would be glad to help out if I'm ever in your neck of the woods.
Curious with the black locust, would you trap the back to protect the belly? I have a piece I've been eyeing up, was thinking of a rawhide backing on it.
I live in Utah. I've seen a couple pecan trees in yards, but I've had to buy all the other hickory I have used. It's hard enough to come by even with a MacBeath's Hardwoods around, that I have sawn an axe handle in half lengthwise at least three times before for matched backings.
No immediate plans to head out there, but my little sister and her family now live in Wisconsin, so, never say never. Hickory just behaves well out here in the dry.
Most of the black locust staves I have used was relatively small diameter, crowned so I never trapped it and did a flat belly. I always have trapped it when hickory or bamboo backed. You just have to remember that it is STIFF more than than it is elastic. If I had large diameter stuff, I would probably BARELY round the belly to match the back, maybe? Splitting hairs, really.
I personally feel like BL has a bad rap on being "weak" in compression. You just can't treat it like osage orange.