I would use hormodin #3 (o.8% IBA)

An oak is not a geranium, when did you ever hear of someone rooting a cutting of an oak?
There are a handful of clones of oaks which are propagated by grafting. You need a seedling (for understock) of the same species that you want to propagate, graft it ASAP, you're running out of time this Winter.

It was always my understanding from my college days (Ornamental Horticulture Major), Oaks will not root, and if they do they're not likely to survive the first winter.
Cultivars are usually grafterd onto the species root stock.

Mike Cassidy

And, even then, the red/black group doesn't tend to do very well with grafting attempts - peroxidase enzyme incompatibilities result in frequent graft failure, even when a selection is grafted onto its own seedlings.
White oak species graft pretty readily onto almost any other white oak species. I typically use bur oak as a universal rootstock - mainly because I've got plenty of them.