Chris-

Sounds great. What is the rifling profile? Do you know if this rifle's been shot fairly recently?

If you're going to post photos, also include the proof marks on the action flats and the barrel flats. Someone here will most likely be able to steer you in the right direction as to starting loads for it.

Have you handled and shot double rifles in the past?
There are books out there on the subjec of their proper care, handling, and feeding.
This forum is a great resource for information in each of those regards too.
I look forward to seeing what you have to show us.

--Tinker