I have split "Sycamore". The toughest wood I've ever encountered.
I've split Gum, the Oaks- they vary, red pretty easy, post is knotty, white.can really vary. Sycamore grows in a TWISTED layered effect.
I've never split any Gum nearly as TOUGH as Sycamore.
How do other woods compare, like mesquite ? Other tough splitters.
We have Cottonwood in a Ark but haven't split any.
Jerry